Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4cb03cc6c8f60bc…

MALICIOUS

PDF

81.6 KB Created: 2021-06-07 10:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a4c597deaa4a85e1c1ed6ce2f21c20e5 SHA-1: 719cd470e197765282843111146d8ff77bbcb328 SHA-256: b4cb03cc6c8f60bc6d42a67fe41475cc984d2d126a6ef838a6fbeb98495b47de
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://synerhu.ru/pbw?utm_term=dot+net+framework+4.0+full+offline+installer PDF link annotation
    • https://podosutopo.weebly.com/uploads/1/3/4/5/134590637/nexusegup.pdfIn PDF document text
    • https://repositugi.weebly.com/uploads/1/3/0/7/130738607/835beedd43526.pdfIn PDF document text
    • https://zenimuxen.weebly.com/uploads/1/3/4/3/134317926/5051298.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374848/normal_6010ce21e708d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377095/normal_6041a7fa962e6.pdfIn PDF document text
    • https://koruguliduni.weebly.com/uploads/1/3/4/8/134896859/919f594041b38.pdfIn PDF document text
    • https://rivupabageram.weebly.com/uploads/1/3/5/3/135323939/tunodekitawupel-wewumijuku-feduvesos-noram.pdfIn PDF document text
    • https://mamowoxu.weebly.com/uploads/1/3/4/2/134265364/f713bce3fc25e.pdfIn PDF document text
    • https://dowamodugepaxa.weebly.com/uploads/1/3/0/7/130739159/e41c7.pdfIn PDF document text
    • https://nozojotama.weebly.com/uploads/1/3/4/5/134585139/kodewejipes_tokenum_sikesogu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379230/normal_5ff0e8ea975e1.pdfIn PDF document text
    • https://tetiwaxope.weebly.com/uploads/1/3/0/7/130776033/9529998.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465128/normal_602c356881b33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454280/normal_605bb2c8516f8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kunozulig.pbworks.com/w/file/fetch/144613839/free_shutter_count_checker.pdfIn PDF document text
    • http://dimutojopog.pbworks.com/w/file/fetch/144443424/77031079749.pdfIn PDF document text
    • http://biwonuv.pbworks.com/f/dizupedevetezafi.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AC 5328 bytes
SHA-256: bdad3d7cc478bfc47a3ed4a3769a6d6023cc392336d0988a2944562f76029f47
font_01_sfnt_off000107db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DB 15420 bytes
SHA-256: efa2c75c3b56c889930a1b5fcca1768ff9215b7e94c21c0fa0168bba6c6570d5

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