Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d3e92618e0f332d…

MALICIOUS

PDF

71.5 KB Created: 2020-11-10 21:50:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: ea5eb6ec13c50e333a85b7605a5849f2 SHA-1: d967be41cee265c492c9995be9647b317143df24 SHA-256: 4d3e92618e0f332d27811e6c3d7a112382a92fd497243fdd024ab968146bcf6c
246 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses brand-impersonation credential phishing. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/388efb16d8559cf.pdf.
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffking.ru/strik?keyword=app+rewards+programs PDF link annotation
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/388efb16d8559cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365602/normal_5fa00fb029047.pdfIn PDF document text
    • https://razixolinatu.weebly.com/uploads/1/3/4/3/134384461/0218eca78d6849.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369936/normal_5f888651cba8e.pdfIn PDF document text
    • https://zozilevijuni.weebly.com/uploads/1/3/1/3/131383476/vamasafanegozosubora.pdfIn PDF document text
    • https://rokejowavati.weebly.com/uploads/1/3/4/2/134265467/6457949.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/5401885.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ce0d8f9-5300-4cc2-9d0f-c5ba8d0ee7d7/73522686697.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/gusuxokodekedamaruk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd04edde-4dca-4e8c-918c-5fa078f69ad4/73546704057.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/333417c1-9e9e-4ad9-b186-308ea3eaba25/rinoa_super_genius_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4010d2e-1d73-4d5d-92d5-166ae7fcb7ea/91079249256.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC58A 5328 bytes
SHA-256: ae8742f005633da2e84ebf81a1fc30fb515a12c1633611369b813274942d5bd4
font_01_sfnt_off0000d7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A5 10616 bytes
SHA-256: d6c4491dbd7460a81c55baeeed6ffe113793a7ce3a9213386a2c4e966d9ecf0b
font_02_sfnt_off0000fbd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD5 16232 bytes
SHA-256: cb0239a5e77cb37740da0b4997a5f47117ed526887f952b298c44ef8b2f17e18

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