Malicious PDF — malware analysis report

Static analysis result for SHA-256 146d0d625f480343…

MALICIOUS

PDF

79.0 KB Created: 2021-05-24 13:49:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: cfd4de133f5b97d0d96efe259368a53b SHA-1: 7a62057e570aaa5f09f53fed00a2da93754ce58c SHA-256: 146d0d625f480343d8bf474242908ed6a15f0b02622bf7cd8ea08f54af5b4ec9
344 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document is identified as malicious by multiple heuristics and ClamAV, indicating it is a phishing lure. It contains a large number of external links, many hosted on disposable domains, and impersonates a brand to trick users into clicking. The document body, though truncated, suggests a lure related to social media conversations, likely directing users to a malicious site for credential harvesting or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://furobafesenere.weebly.com/uploads/1/3/4/6/134626717/nudopuva.pdf.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://yafferge.ru/strik?utm_term=how+to+delete+all+conversations+on+messenger+android In PDF document text
    • https://furobafesenere.weebly.com/uploads/1/3/4/6/134626717/nudopuva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465388/normal_6018e4d9337a9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410194/normal_5fc6640b7f1ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416506/normal_60579b1462b85.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406170/normal_5ffa119e7a52c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412899/normal_5fd5f04cdf084.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375515/normal_5fe6cc9a3911f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388050/normal_602269c718e8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450340/normal_60383f7cb52e2.pdfIn PDF document text
    • https://panelaxefejavej.weebly.com/uploads/1/3/5/3/135306159/gegadujitakunej_magixijurefepoj_derugurimadawax_varasedorupadal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464082/normal_606b3edab6093.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422620/normal_604cc0fb38298.pdfIn PDF document text
    • https://rifijilaguselud.weebly.com/uploads/1/3/4/8/134846829/6370486.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471706/normal_601c5f236efa9.pdfIn PDF document text
    • https://belogakarukulu.weebly.com/uploads/1/3/4/5/134502602/51678.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369310/normal_5fd77ab55011b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444371/normal_60121acb258d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448330/normal_605b726cdf822.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nemafu/98879667368.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40e93a45-4304-43eb-b7f5-bf267ad5c540/jefejumomanonetawodu.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/tamil_actress_hot_photos_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/nabifovu/36730027948.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75e9b2ae-1d31-4cc6-928e-02c132d5dcf5/84106198356.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6008c7a-d798-4a98-a6d1-571e69bb4cc8/tempe_town_lake_running_path.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b903266-5e3b-4ffb-897c-4efc17f57892/examples_of_biblical_allusions_in_beowulf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/154dd26c-bd0a-4abe-9b47-e4277bdff895/vector_calculus_identities_proof_index_notation.pdfIn PDF document text
    • https://s3.amazonaws.com/warapagefasovi/aqueous_humor_formation_ppt.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF627 5372 bytes
SHA-256: 28fdff98c6e48dcf2927477cd7913a4bb86cf0cf77173aac11f075ea3f425ec6
font_01_sfnt_off0001086c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086C 10968 bytes
SHA-256: 2867ff771835f8fb84e2d01f1329d95012f9cdd4fd16852fb2e8409b4c7749e2

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