Malicious PDF — malware analysis report

Static analysis result for SHA-256 77f173373044edd9…

MALICIOUS

PDF

67.4 KB Created: 2020-12-21 16:20:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 79911f764644c9a501106725672dd748 SHA-1: 1e2208f4c9bf1a9d8b73ea5fa2b3bac9336215b1 SHA-256: 77f173373044edd9a1a33a801249cdad6f976b0c631637b78294b485fe3592db
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://traffnew.ru/strik?utm_term=rta+smart+drive+app+download PDF link annotation
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/tefinopixiw.pdfIn PDF document text
    • https://pejusokipa.weebly.com/uploads/1/3/4/9/134902294/d2a3fd82882.pdfIn PDF document text
    • https://pezopipowom.weebly.com/uploads/1/3/1/4/131406060/megopipedi-kekewubu-zipepune-sixerobev.pdfIn PDF document text
    • https://nukubutoti.weebly.com/uploads/1/3/2/3/132302768/kujox.pdfIn PDF document text
    • https://vidojibirulon.weebly.com/uploads/1/3/1/0/131070792/genigivo_jofonesoxip_fojesuv_waxidiwodunurux.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/zabejuvijolu/lagigimodigibo.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/shrine_of_saint_joseph_stirling_nj.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/fopumatenijezo.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/86027016566.pdfIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/forms_of_precipitation_in_hydrology.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/free_host_booter_for_xbox.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4cd95e9fc3622d53af778/t/5fc6c34b4f9413233b0aee04/1606861643337/dewejo.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/lux_build_guide_mobafire.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/centrifugal_pump_preventive_maintenance_checklist.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/72044706965.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_off0000c9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F3 5264 bytes
SHA-256: 8399a35c5df626d341d688d3278f99d4f834a6a194297c531a6ffed3eb58ce5f
font_01_sfnt_off0000dbdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDD 10920 bytes
SHA-256: f274b21bc87cab9190ac9e4cadb0ac97961d050246a4ab7317bbe8fd63797637

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