Malicious PDF — malware analysis report

Static analysis result for SHA-256 431b9356e157c435…

MALICIOUS

PDF

93.5 KB Created: 2021-03-20 11:28:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 064cd7050626c15c59e1d5666b61e27c SHA-1: 5cb10202fa4fa4559e99f0e42d7f489644b54872 SHA-256: 431b9356e157c435032ea5a1ef3a906f01e597c32577869c12ec98d37bfe715f
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicative of a link farm or SEO spamming operation. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://zajinet.ru/wix?keyword=persona+4+mitsuo+boss+guide PDF link annotation
    • https://xemegejimeje.weebly.com/uploads/1/3/1/6/131636808/1159208.pdfIn PDF document text
    • https://panikelixiguju.weebly.com/uploads/1/3/4/4/134478359/d14dff2302a675a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412593/normal_602982ab3e7c8.pdfIn PDF document text
    • http://ruregere.sportsontheweb.net/grade_4_math_textbook_mcgraw_hill.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421611/normal_6049770928cee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465264/normal_5fe3ffadeb3af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414689/normal_601879597dd46.pdfIn PDF document text
    • http://nutesane.iblogger.org/bandura_social_learning_theory_1977.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382429/normal_602b000fb4867.pdfIn PDF document text
    • http://kozidozilujivox.getenjoyment.net/11983229499.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/ded8a5de-7fea-4d58-b890-e5917c2ee76f/netgear_dgnd3700v2_firmware.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/865bb48a-95e7-48bb-962b-7b21adfe4260/ferrari_logo_vector.pdfIn PDF document text
    • http://kegipufi.rf.gd/marvel_shield_logo_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a8b633b-05d9-4e0a-82f5-79fca1fc8e82/carefree_rv_awning_fabric_replacement_instructions.pdfIn PDF document text
    • http://vobewegogiz.rf.gd/haralambos_sociologija.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/941cbb06-c237-4e83-93fc-a2de63483dfc/75278774357.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/147b7991-3bd6-43b3-9f19-a1f8dfe830b5/how_to_switch_between_characters_jump_force.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0223d778-a2c3-47ce-8d53-042432b409a6/zuzarireku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04d187fe-ba84-4611-afde-9b4384fa54c3/dovitumuninupu.pdfIn PDF document text
    • http://betakudo.atwebpages.com/dizeno.pdfIn PDF document text
    • http://bototiluwoge.atwebpages.com/43238711732.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3B 6696 bytes
SHA-256: d1274537ab0f108ed1fa6833387b92fc59d88df631c67137068ea69c1a004815
font_01_sfnt_off000122f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F9 5224 bytes
SHA-256: 81e1726b78602fc88a83582e5f49bab8cced4bcb003a8374882b6a70a1eebc28
font_02_sfnt_off0001349c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1349C 11224 bytes
SHA-256: 7838344b6989fa6e022417a7c6cd61627d9a5a749cf3495a661708f87815f495
font_03_sfnt_off00015a67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A67 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378