Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7a7f36511dabb98…

MALICIOUS

PDF

156.3 KB Created: 2021-05-31 13:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 99bebf416f6a326ea2974d650a7fb2f7 SHA-1: 5c2e2a2cd42f73068b5f596008cd4817076d3561 SHA-256: b7a7f36511dabb98518b332f7300264ecbd12faa282852ff75df092f54f91d88
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing campaign designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a likely attempt to distribute malware or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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 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://druttle.ru/123?utm_term=cid+episode+604++mp4 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446490/normal_606ce176ddfac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476007/normal_6026677d5cff6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459035/normal_60414af52c9cf.pdfIn PDF document text
    • https://wimupivirexov.weebly.com/uploads/1/3/4/9/134901171/komilam-jasijijakuxoro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377410/normal_605bfe79ad302.pdfIn PDF document text
    • https://zizusufake.weebly.com/uploads/1/3/4/6/134646877/f514eaea75.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379053/normal_5fcce4ec587eb.pdfIn PDF document text
    • https://mabaxezo.weebly.com/uploads/1/3/4/7/134766945/dorudilafomoze-saxikinul-dikozeguzi-sirafivuxus.pdfIn PDF document text
    • https://bajiwemijowulu.weebly.com/uploads/1/3/5/9/135990815/9123fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477637/normal_60252d1d511f4.pdfIn PDF document text
    • https://dixamagajo.weebly.com/uploads/1/3/4/6/134652312/vijenijajoxi-bafetef-mujul.pdfIn PDF document text
    • https://jinijazi.weebly.com/uploads/1/3/4/6/134668286/mabopew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485004/normal_6016516604d75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381101/normal_5fd3be74d7c95.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474998/normal_5fee7d7d99ea6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414867/normal_604aa6604a5c4.pdfIn PDF document text
    • https://taxurazuzar.weebly.com/uploads/1/3/4/0/134042721/turur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0002294e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2294E 5056 bytes
SHA-256: b60faf88c8a9cde21e0affd33c9a64d36fe652cb338a83e504b570a3077d1727
font_01_sfnt_off00023a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23A78 11576 bytes
SHA-256: c1be10af0e175ad6a0e2bac884cb1e5fdc219885af9a8ce92cf78045a3746f98

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