Malicious PDF — malware analysis report

Static analysis result for SHA-256 b07601750e07bc27…

MALICIOUS

PDF

96.3 KB Created: 2021-02-13 15:35:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 471143935f15622154b42f96cf813c58 SHA-1: 03bfa729d98afa34af288d22c978dd2f6c99694c SHA-256: b07601750e07bc274a315560356a27c87dde44cfb1955d06fc049dd36de20d80
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-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.
  • 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://seumenha.ru/123?utm_term=william+faulkner+that+evening+sun+summary PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368471/normal_60090623a9d34.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460950/normal_5ff362009fbc8.pdfIn PDF document text
    • https://cdn.sqhk.co/bifoligi/0sJgihu/dabelifukavusepesu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372104/normal_602711f14b0d3.pdfIn PDF document text
    • https://lopomibuliwipa.weebly.com/uploads/1/3/1/3/131381919/2dc99d828.pdfIn PDF document text
    • https://cdn.sqhk.co/todusukiraxi/hfhbijs/44054162136.pdfIn PDF document text
    • https://cdn.sqhk.co/ninoporaleva/jhUzgdl/19977172235.pdfIn PDF document text
    • https://cdn.sqhk.co/fogibadeku/fjbgghd/gisemoreruduponutujim.pdfIn PDF document text
    • https://cdn.sqhk.co/zujubiviv/Tjdhe05/jump_spiral_slide.pdfIn PDF document text
    • https://jisofuzevilane.weebly.com/uploads/1/3/0/9/130969501/3e0b0c.pdfIn PDF document text
    • https://garotilalu.weebly.com/uploads/1/3/0/7/130739336/simumizapozubi-xerinobu-wigokawawif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485435/normal_5ffe1c779004b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470982/normal_6025c0ab05363.pdfIn PDF document text
    • https://cdn.sqhk.co/poxufape/4iemThh/68808694803.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451377/normal_6016073558104.pdfIn PDF document text
    • https://saletenabij.weebly.com/uploads/1/3/4/3/134339554/dac9c1d6854d18d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382190/normal_5fd8fbc95e0d8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://divapikej.rf.gd/dj_goyang_akimilaku_remix_2017.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_off00013bcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BCD 5420 bytes
SHA-256: f71169595e382e734e35e65951b720b88a25d65cdf2a76af3cd62b94e56b9a2a
font_01_sfnt_off00014e31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E31 11036 bytes
SHA-256: 9a061007a9d8b62ab53e3f8d147065cc6a2e62a88d9eaa8f5a091e45c86abebb

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