Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6ca271ef81f2c0e…

MALICIOUS

PDF

74.2 KB Created: 2021-03-27 10:55:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 3bcd649cf0d25cf1bab9604b1c681464 SHA-1: fcc4e721f99eef4f823030b68ba8ee359db66d2c SHA-256: a6ca271ef81f2c0e4c149bed45d3c1681b863c27601e5ec1262c449dd6258af9
186 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, containing numerous external URIs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure itself facilitates redirection to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/award?keyword=water+prevention+control+of+pollution+cess+act+1977+pdf PDF link annotation
    • https://sevofesimexiv.weebly.com/uploads/1/3/4/7/134765092/8d37ae6ad6.pdfIn PDF document text
    • https://cdn.sqhk.co/vikafaselida/jjMieig/confusing_math_questions_and_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/duwewofowus/HpEjehj/tumovab.pdfIn PDF document text
    • https://cdn.sqhk.co/sewuvavimebi/cQthfhg/razufezenuxus.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/djfghOK/bagudin.pdfIn PDF document text
    • https://cdn.sqhk.co/sozimelizak/ggDjjii/dont_touch_my_phone_muggle_draco.pdfIn PDF document text
    • https://fuvapele.weebly.com/uploads/1/3/0/7/130738919/364873.pdfIn PDF document text
    • http://kopuvimu.scienceontheweb.net/kubazupuwu.pdfIn PDF document text
    • http://rejorevubirobu.sportsontheweb.net/83973218863.pdfIn PDF document text
    • https://vuduzilir.weebly.com/uploads/1/3/1/8/131857383/8096235.pdfIn PDF document text
    • https://cdn.sqhk.co/tekonunise/J4Nvoia/my_boat_plans_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/vevigagexoxa/o8qsngd/rider_vs_iona_prediction.pdfIn PDF document text
    • https://jugivukovetid.weebly.com/uploads/1/3/0/7/130739525/nubunif.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/lomuper/7856848677.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/kohler_dtv_mode.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/vujorifevulojilo.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/28958927079.pdfIn PDF document text
    • https://s3.amazonaws.com/vasofirida/hoyle_casino_games_free_full_version.pdfIn PDF document text
    • https://s3.amazonaws.com/juwofuxufijup/59785391244.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/70616329297.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e40e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40E 5512 bytes
SHA-256: 3e147bf5c13717663634d25a8fb0e6d65ab387c4d85bea08984f8b12408b02f5
font_01_sfnt_off0000f6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F7 10592 bytes
SHA-256: 7d3f95a4c27f8ce7fe577ab60ffec8e0cc3d97748efb998f1f4cc9b9ad2ae66f

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