Malicious PDF — malware analysis report

Static analysis result for SHA-256 f002a9bef4afc6ac…

MALICIOUS

PDF

74.0 KB Created: 2021-04-05 01:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 7bfc17f74264b32ed0efb735abc1c831 SHA-1: 94d463c61db222b8d17c4170f038c09c403f3fa8 SHA-256: f002a9bef4afc6acc4402fc608d9ea7e931e3c7d222e0a1f8cbc781f243ded6e
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous external URIs pointing to various PDF files. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of embedded URLs reinforces the attack pattern of directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://bologen.ru/award?keyword=the+dark+crystal+creation+myths+volume+3+pdf PDF link annotation
    • http://vurujupafowutox.mypressonline.com/the_freud_reader_online.pdfIn PDF document text
    • https://vitovoraf.weebly.com/uploads/1/3/1/1/131164311/7364928.pdfIn PDF document text
    • http://kevakigev.medianewsonline.com/63789973577.pdfIn PDF document text
    • http://gelokan.sportsontheweb.net/lyrical_ballads_poems.pdfIn PDF document text
    • https://kikitepolo.weebly.com/uploads/1/3/4/5/134514310/7247142.pdfIn PDF document text
    • https://roralolew.weebly.com/uploads/1/3/0/7/130775143/pawugivibud.pdfIn PDF document text
    • https://vipopatovosidop.weebly.com/uploads/1/3/0/7/130775456/vemamepu.pdfIn PDF document text
    • https://lozezuxugi.weebly.com/uploads/1/3/4/0/134016676/sifoganosoben.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365620/normal_6040316e3b191.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485828/normal_5ff00a497232c.pdfIn PDF document text
    • https://powifamule.weebly.com/uploads/1/3/4/7/134757347/e4d870df5424.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453719/normal_5ff7adf693270.pdfIn PDF document text
    • https://teguvubab.weebly.com/uploads/1/3/4/3/134347924/6338225.pdfIn PDF document text
    • https://juzemadarerux.weebly.com/uploads/1/3/1/4/131437885/c8cca81.pdfIn PDF document text
    • http://sevezor.scienceontheweb.net/70465451771.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://boxijekew.atwebpages.com/similar_triangles_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/xalasawu/tc-helicon_voicelive_play_acoustic_vs_boss_ve-8.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/lagu_ardina_rasti_kangen.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/nisinaxoselo.pdfIn PDF document text
    • http://tikomiwewo.atwebpages.com/4564308735.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/apc_back-ups_office_350va_replacement_battery.pdfIn PDF document text
    • http://madigekole.onlinewebshop.net/66456536389.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_off0000dfe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE1 5736 bytes
SHA-256: eef26a6bee18cfb9e8046e5bd6a091b54326c89373b842985059d57092c1ae79
font_01_sfnt_off0000f346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF346 10776 bytes
SHA-256: 2451d36168c47e57de45c0d58b1aaf6f2387c0dce5dd821d26eb82745c0d8791

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