Malicious PDF — malware analysis report

Static analysis result for SHA-256 3520cd29da9b5c62…

MALICIOUS

PDF

76.8 KB Created: 2021-05-24 07:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: df57eaee6691e4c6c618135275bdc606 SHA-1: dc92e62c1186ab048c45bef9d9f0533cee879e32 SHA-256: 3520cd29da9b5c625605f914d1c582a6fb33599c22bd5ba498baef0a4ec1b1bc
186 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. 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 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://crophysi.ru/strik?utm_term=6.3+preterite+tense+of+regular+verbs+worksheet PDF link annotation
    • https://gazodajatara.weebly.com/uploads/1/3/2/7/132712558/4560695.pdfIn PDF document text
    • https://jafovoguna.weebly.com/uploads/1/3/4/0/134096268/gewixi-tadevebanigomok-fokufebakido-pupuxesel.pdfIn PDF document text
    • https://nopogevoxipati.weebly.com/uploads/1/3/1/4/131410158/wabezelil.pdfIn PDF document text
    • https://pibusabet.weebly.com/uploads/1/3/4/6/134695111/303640.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445881/normal_600519fdae682.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413121/normal_60438db714523.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367912/normal_6060db80839e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478923/normal_5fccfba838d75.pdfIn PDF document text
    • https://bojufare.weebly.com/uploads/1/3/1/0/131070992/timapola-nenatodakij-kejiwofoben-gewuzube.pdfIn PDF document text
    • https://debinezituxi.weebly.com/uploads/1/3/4/3/134339783/4433626.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458837/normal_5fe6a97da4106.pdfIn PDF document text
    • https://fimiximokizo.weebly.com/uploads/1/3/1/3/131384127/tesosesek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454966/normal_6056f229cd8ef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/0c9393b1-d261-46aa-b779-dd74194434c3/84690884957.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95a645c5-2b25-44f9-b08f-b15e5f782933/tulivuzowiwisalatozimes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bb9d5dd-f3b2-46f4-8249-996704d5f577/77098140936.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7161ea45-a843-4827-befb-191a17b948cf/dnd_5e_name_generator.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD8 5656 bytes
SHA-256: 584baa44c09f8d046bbb8e57045b34c7795b1c31d0ad2e3b054726544ad97f21
font_01_sfnt_off0000f11b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11B 11936 bytes
SHA-256: 084da36f5ed57e61dfa37b1b2775b4bb69ee522edb04eeb359dc809bcca03ab1
font_02_sfnt_off000117f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F5 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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