Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b4e445bd9ac8184…

MALICIOUS

PDF

68.0 KB Created: 2021-03-29 05:33:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8c134e3fd6ce9fe012e75bef758f9a4 SHA-1: d093c21fcabb77ccda9c5ec0718d73d98ed4d42a SHA-256: 8b4e445bd9ac81842ac3cc885c3feac3905ee9ff9ba6360d178507ba21c50726
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as legitimate content like workshop manuals. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the redirection to numerous potentially malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/wix?keyword=honda+gx160+workshop+manual+free
    • https://cdn.sqhk.co/guvevifowo/dUVh1hd/modern_warfare_season_4_weapon_mastery_challenges.pdf
    • https://cdn.sqhk.co/tasewapimol/gcEhjje/wish_apple_watch_5.pdf
    • https://cdn.sqhk.co/mixubiki/hcEhhhh/ice_cream_flavors_selecta.pdf
    • https://cdn.sqhk.co/dinigivo/UBMgjhd/65518604027.pdf
    • https://cdn.sqhk.co/ribobujir/8bciehi/82416731986.pdf
    • https://cdn.sqhk.co/fowipovoji/btIe8bZ/95661346779.pdf
    • https://jesabison.weebly.com/uploads/1/3/4/3/134379325/bf2268d963.pdf
    • https://cdn.sqhk.co/jijasitov/bhdLLBk/61689911558.pdf
    • https://cdn.sqhk.co/divekezor/ZtsSE7g/bein_sports_usa_comcast.pdf
    • https://cdn.sqhk.co/kuxixixixi/hcbptjj/95494527380.pdf
    • http://feremujidonigu.getenjoyment.net/55375177270.pdf
    • https://cdn.sqhk.co/zuxatotukaru/hbjajdz/gaxijizawuziwisamanufuj.pdf
    • https://cdn.sqhk.co/zobelekivix/Pcyhghh/jisutigunuloluzirepe.pdf
    • https://cdn.sqhk.co/finizaga/aWoFLON/60183300485.pdf
    • https://divekoworubu.weebly.com/uploads/1/3/4/0/134017674/mitogaben.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://gefilodeza.myartsonline.com/athletics_track_and_field_events.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c187.bin
b2557ab4c9d24823c78e48308df5fd2f029e367c8348da818b20961d8dabd80c
pdf-font-stream PDF embedded font (sfnt) at offset 0xC187 5740 bytes
font_01_sfnt_off0000d4f6.bin
4b19d0bf8ddb721dbb110359191065ea8a6fbb006bdb5e7cd9229bfd8e7585c3
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F6 9416 bytes
font_02_sfnt_off0000f51d.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF51D 4324 bytes