Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f8ba76400b0a314…

MALICIOUS

PDF

75.0 KB Created: 2021-02-21 08:29:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c3a2a2f15b52590143f103452a55a7bc SHA-1: b23027054ed26f870f52a9d79fce235b991b0af5 SHA-256: 9f8ba76400b0a3140a2551d181d462a18bd072f4a311a807569cd00161400bc9
196 Risk Score

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://bologen.ru/123?utm_term=sat+math+calculator+section+time PDF link annotation
    • http://usersdeviceprotectionservice.site/zupazupunugopilotedoxuvobetxcd.pdfIn PDF document text
    • https://xesusilinani.weebly.com/uploads/1/3/0/8/130874458/5ffb8c414a147b.pdfIn PDF document text
    • http://soldonlittleton.com/80244569260i0sqv.pdfIn PDF document text
    • https://tekaxudifen.weebly.com/uploads/1/3/5/9/135992886/siweponegenu.pdfIn PDF document text
    • https://zimolitavok.weebly.com/uploads/1/3/1/8/131856331/a760e766b2b.pdfIn PDF document text
    • https://fatatarulawug.weebly.com/uploads/1/3/4/4/134474158/b644a53105e.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwumixe/fHVgehd/love_stories_movies_in_telugu.pdfIn PDF document text
    • https://mawetifatine.weebly.com/uploads/1/3/2/6/132683292/kakafato_vinokomutizunej_zadesomomefi_rogewezemife.pdfIn PDF document text
    • http://znakomstva18x.site/xizarozamopufadusotujoki9ji6p.pdfIn PDF document text
    • https://cdn.sqhk.co/numorolele/3ha0dgh/wanunuxenamuv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/mezunovagiwobew.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/zegidef.pdfIn PDF document text
    • https://s3.amazonaws.com/divikufifir/51172558903.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/risewotexewivotunebev.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/92077621455.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_off0000e929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE929 5140 bytes
SHA-256: 83f25d32ec1606287a9f57fb7c66603a76e77fad4a2c8a35d147c735e44f0576
font_01_sfnt_off0000fa74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA74 10788 bytes
SHA-256: e69396bdebf1ee5aa6e072332129cbd6b0be17d60b6d9dea8bc555dbf147aa70

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