Malicious PDF — malware analysis report

Static analysis result for SHA-256 c170e45e0538c3ec…

MALICIOUS

PDF

71.4 KB Created: 2021-02-18 23:49:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f2417620d9f23cbb78656396bb0ed263 SHA-1: 8920bb93e8e70ecc51e7cc87a3307c531d9f35bc SHA-256: c170e45e0538c3ec8f8f8c7db283790000efece99030054fc3c03fb1067e00c8
166 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. It uses a password-protected-archive lure. 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/123?utm_term=my+hp+deskjet+3054+is+printing+blank+pages PDF link annotation
    • http://tvoyoproc.fun/sabosurimla3.pdfIn PDF document text
    • https://cdn.sqhk.co/bosamame/ihicP6N/17136183910.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453551/normal_5fcc0c00a191b.pdfIn PDF document text
    • https://cdn.sqhk.co/jokawefezo/gimgjgc/house_party_fortnite_code.pdfIn PDF document text
    • https://cdn.sqhk.co/maxevurux/cUhjlhi/craftsman_snowblower_oil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369330/normal_5fe825177fbe0.pdfIn PDF document text
    • http://poradoit2.site/bsc_agriculture_colleges_in_hyderabad8uwuf.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/9ieieib/52124079171.pdfIn PDF document text
    • http://tryne.xyz/cartoon_movies_2018_list0elrl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412763/normal_5fe3892ec5b1a.pdfIn PDF document text
    • https://cdn.sqhk.co/daxerarugak/ijgVieP/realme_c2_lock_screen_password_reset.pdfIn PDF document text
    • http://anarchymedya.com/dress_patterns_formal3e3q8.pdfIn PDF document text
    • http://prizinsta24.online/b_arch_question_papersm0ek.pdfIn PDF document text
    • http://hamlikjorettoop.ru/gravity_falls_saw_game_guidehqo9j.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/jevelel/teri_aankhon_ka_yo_kajal_pagalworld.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_off0000d79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79F 6128 bytes
SHA-256: fa56f61a89de03d6109f81742b6e591e676ea3dd778d62c324276db7b6f923b2
font_01_sfnt_off0000ec8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8F 10612 bytes
SHA-256: 2ea1c72e1e7331367c591b23e4168967ef50310efed2fd559d851d8a57ece64c