Malicious PDF — malware analysis report

Static analysis result for SHA-256 9caa29f62cbc5ded…

MALICIOUS

PDF

61.1 KB Created: 2021-02-17 21:04:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: f7023fbe5da0275ba98a19e1f2d4e8d4 SHA-1: 92679e55012e68d4381671f1787dbf9543776331 SHA-256: 9caa29f62cbc5dedec2b60419a630c82a721fc46707c45b422cbf60c309606fc
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File T1059.007 JavaScript

The PDF document employs a social engineering lure, instructing the user to install a browser extension or update to view content, a common tactic for malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious sites, potentially for further exploitation or payload delivery.

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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/strik?utm_term=killing+floor+2+xbox+one+server+status PDF link annotation
    • http://leqqurint.online/android_tls_cipher_suitesvq7ni.pdfIn PDF document text
    • https://cdn.sqhk.co/tajixixejafi/Csggjrc/kupogixakewafotegilupi.pdfIn PDF document text
    • https://juporolo.weebly.com/uploads/1/3/1/3/131380745/jofuro.pdfIn PDF document text
    • https://cdn.sqhk.co/xerejijasoma/ieKggAG/stampede_houston_shooting.pdfIn PDF document text
    • https://tixonanixob.weebly.com/uploads/1/3/4/8/134890866/renenofazuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484356/normal_6017089743724.pdfIn PDF document text
    • http://zoom-omsk.ru/92057041516rf0he.pdfIn PDF document text
    • http://marketitaly.pro/google_sheets_if_cell_contains_partial_textqv9uf.pdfIn PDF document text
    • https://lavowoluxep.weebly.com/uploads/1/3/5/3/135388351/dafadec0c99.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuzidonul.epizy.com/31696263684.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/hssc_lab_attendant_syllabus.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/5331642517.pdfIn PDF document text
    • http://xuwabofori.epizy.com/jelakukaxini.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_off0000b363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB363 5304 bytes
SHA-256: 906900da1f9065388c48b19b10273e081fb2cee2ea2c1f77dbe19940a8146a6f
font_01_sfnt_off0000c593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC593 9872 bytes
SHA-256: d97e4c0f35beff48f83bac6e11b6e6f3ec5959466395e13822112c45bdf9da14

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