Malicious PDF — malware analysis report

Static analysis result for SHA-256 9438172dcf9bd2ee…

MALICIOUS

PDF

79.1 KB Created: 2021-02-21 22:49:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 7adc527cadbf97ded53772e154237578 SHA-1: 53c200d309f84bf0040f7e9ea8b0f4acfbc87474 SHA-256: 9438172dcf9bd2ee0314275e93e956fabe9b6534a3b5edad4b067dda90679317
186 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 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://druttle.ru/123?utm_term=english+listening+and+speaking+app+for+pc PDF link annotation
    • http://jirafka.space/community_center_design_guide4mgsa.pdfIn PDF document text
    • https://wadezadoli.weebly.com/uploads/1/3/0/9/130970015/8787133.pdfIn PDF document text
    • http://nosinoski.shop/pes_club_manager_for_pci09ov.pdfIn PDF document text
    • http://amsidisi.xyz/jumpin_jack_flash_bass_tabm3n3b.pdfIn PDF document text
    • http://uptodate.site/44235464878ekp6q.pdfIn PDF document text
    • https://rawekawus.weebly.com/uploads/1/3/4/4/134467784/gafixazupapagu_tixipogal_mebaraxujotulew.pdfIn PDF document text
    • https://rejifiri.weebly.com/uploads/1/3/1/3/131380436/a6a9f2d5.pdfIn PDF document text
    • http://trixy-matrix.space/verizon_one_talk_applicationsthqk.pdfIn PDF document text
    • https://faruroju.weebly.com/uploads/1/3/5/9/135986438/foranowugez_mojugoz_wiworuvosufu.pdfIn PDF document text
    • https://vaxokivov.weebly.com/uploads/1/3/1/4/131453734/2ab739806b651c4.pdfIn PDF document text
    • https://cdn.sqhk.co/didatife/geVijjb/siegefall_mod_apk_offline.pdfIn PDF document text
    • http://eroganoficial.site/georgia_guidestones_reduce_populationp0qlk.pdfIn PDF document text
    • http://usblighter24.site/ma_drivers_education_manual8f8x7.pdfIn PDF document text
    • http://milanomoda.site/candide_voltaire_page_counthv02c.pdfIn PDF document text
    • http://taptopbot.com/jon_snow_and_ygritte_episode_guide22sqx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83F 5436 bytes
SHA-256: 80ae2bdd7e46b713279356cebd7264955a6f55fb0ddd873b8461ada8e0463a7c
font_01_sfnt_off00010ac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC2 10648 bytes
SHA-256: 5beb655310af9bb7313c27d9539ac674ecf0ba3f23665ca2520a3e4e22dbf97e