Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ad1fd779dc587e…

MALICIOUS

PDF

73.3 KB Created: 2021-02-22 07:19:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: f57d4edbb5c0dd8b5ebbcbd453aa6bcd SHA-1: 548a7ae6d0c1a5bc40d61e0dfedfe25edd43fa7d SHA-256: b4ad1fd779dc587e43002a222a13442d2b0ab5c1f19febf725af3eeeebc6dafb
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple external URIs, with one specifically linked to a "kung fu fury 2 trailer" lure. The heuristic "PDF_SEO_DISPOSABLE_LINK_FARM" indicates a pattern of using disposable hosting for numerous links, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a malicious site for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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=kung+fu+fury+2+trailer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4496170/normal_5fd94ac4707b7.pdfIn PDF document text
    • https://forugizatufuru.weebly.com/uploads/1/3/1/4/131410167/jososuwu.pdfIn PDF document text
    • http://wozuwekifebar.iblogger.org/jerezatakupu.pdfIn PDF document text
    • https://xazonidunigi.weebly.com/uploads/1/3/4/5/134590253/dodoboxavufusujigo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451355/normal_5fd13e6765f58.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407724/normal_5fefc11333334.pdfIn PDF document text
    • http://lajulufubugo.22web.org/fotarago.pdfIn PDF document text
    • http://kimagibasip.22web.org/dokava.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452398/normal_602da182a7420.pdfIn PDF document text
    • http://baxemoge.iblogger.org/perosedawufabesoxulanal.pdfIn PDF document text
    • https://vusimipemukebev.weebly.com/uploads/1/3/0/8/130814393/xalofalu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://padijajuvon.rf.gd/46792589078.pdfIn PDF document text
    • http://lokuvutifinulef.rf.gd/15546728215.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD870 4960 bytes
SHA-256: b9b34aa5f146b80f3b9f6e432e152857596ff39a6a32eb9995f6eb0607f35a6e
font_01_sfnt_off0000e970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE970 1896 bytes
SHA-256: 099d89093be102135c911a0e1d6cb497d4af1896e50bf9510546e5131dedf018
font_02_sfnt_off0000f286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF286 10948 bytes
SHA-256: 08c7160c6792bb18e1dde3c5a869e43babc0bc1718da64caef22697e472c79a2

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