Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe79ce5da8cd9d2c…

MALICIOUS

PDF

88.4 KB Created: 2020-12-17 11:50:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: eb9b6798b904833df83707f6b516d424 SHA-1: 9121b4786a239ad0a4afd0df68330df18d0adb7a SHA-256: fe79ce5da8cd9d2cc80b638ad4d9a2f1308e629821d9d33dcdc09eed2760c3ba
186 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 0.9996

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://traffine.ru/strik?utm_term=sound+energy+examples+and+uses PDF link annotation
    • https://nuxirudeduw.weebly.com/uploads/1/3/4/4/134442083/9617853.pdfIn PDF document text
    • https://japosazononugad.weebly.com/uploads/1/3/4/5/134583509/kelona-piborumode.pdfIn PDF document text
    • https://mexobuvuxe.weebly.com/uploads/1/3/4/3/134369937/9cb618731cd6d.pdfIn PDF document text
    • https://petarukezatu.weebly.com/uploads/1/3/3/9/133997491/46c20c792d2.pdfIn PDF document text
    • https://gabofulonu.weebly.com/uploads/1/3/4/7/134730366/82983aca8.pdfIn PDF document text
    • https://xifobosakup.weebly.com/uploads/1/3/2/8/132815359/9521754.pdfIn PDF document text
    • https://xupulepil.weebly.com/uploads/1/3/4/3/134322414/71c1241e571972.pdfIn PDF document text
    • https://xoselupovogim.weebly.com/uploads/1/3/4/6/134610719/lunarebonug_toxuviz_xugotidiwu.pdfIn PDF document text
    • https://kexexetipo.weebly.com/uploads/1/3/4/8/134897314/delix.pdfIn PDF document text
    • https://saxexowiki.weebly.com/uploads/1/3/0/9/130969873/kinariwujupob.pdfIn PDF document text
    • https://wajigigo.weebly.com/uploads/1/3/4/5/134588105/morifenepe-zoraditix-jigeb-zenevurat.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://s3.amazonaws.com/fejenijovekozu/good_books_to_read_online.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/5660021611.pdfIn PDF document text
    • https://s3.amazonaws.com/taturi/lijajinudowije.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001149f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1149F 27144 bytes
SHA-256: 0b2b287ff34c346d65bec0e17e55e64cea708253186cbad6e23f0ffec5d4d705
font_00_sfnt_off0000ddf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF7 5304 bytes
SHA-256: eef0f34bc53645123b3b7befaafa5b9d46c4cb47043434ed919043a3575cc5e9
font_01_sfnt_off0000efe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE4 11008 bytes
SHA-256: f3308d709305a8dbd3c0321087dc242c0c0d8215acb8e05227dd0dda3fb4c081
font_03_sfnt_off0001440c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1440C 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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