Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe6a35d8f5b87235…

MALICIOUS

PDF

72.8 KB Created: 2021-01-09 03:01:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 0470d92cc458ac8df8bd88418a321d90 SHA-1: 8df6b7f82d8ffb9f761278d246b707b5452ec3cb SHA-256: fe6a35d8f5b872350a16f131c2669afeb0d7d1e7a6905b6f530d56e6b7ca993e
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/123?utm_term=american+flag+sizes+standard PDF link annotation
    • https://kerawidirara.weebly.com/uploads/1/3/4/7/134746453/dimolisuzifaton_xerowu.pdfIn PDF document text
    • https://lepamume.weebly.com/uploads/1/3/4/8/134882258/texekarum.pdfIn PDF document text
    • https://sigakoge.weebly.com/uploads/1/3/4/4/134437147/nikunitatozokapo.pdfIn PDF document text
    • https://fobuxowomi.weebly.com/uploads/1/3/4/2/134235628/jewofuval.pdfIn PDF document text
    • https://pamonufurudanes.weebly.com/uploads/1/3/4/6/134621962/ruvudekozawi-sakeg-dalalad.pdfIn PDF document text
    • https://xewoweduvaji.weebly.com/uploads/1/3/4/6/134680405/6ebdc0c.pdfIn PDF document text
    • https://ruvawuwejijexut.weebly.com/uploads/1/3/0/8/130814193/vajeta_xofowagokazem_kadoxobemekom_bodawaxigelo.pdfIn PDF document text
    • https://cdn.sqhk.co/tamikoveken/BuHhd6G/learn_c_for_game_development_free.pdfIn PDF document text
    • https://kevosenebiv.weebly.com/uploads/1/3/1/8/131871602/leraremedowax.pdfIn PDF document text
    • https://nudaduxovusupin.weebly.com/uploads/1/3/4/3/134337963/piwalituf.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/voxulija/semester_at_a_glance_calendar_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9509b1c6-da56-423a-9ad2-b8481b5c64ed/webapudesemege.pdfIn PDF document text
    • https://s3.amazonaws.com/sukedil/avaya_merlin_magix_programming_manual.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_off0000e06b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06B 5380 bytes
SHA-256: dae48097b89f4d342a9c1b8cf5c628e7c056380bffff75e6183001c7dbac73a7
font_01_sfnt_off0000f2a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A5 10496 bytes
SHA-256: 5239189f895584518e5e00f577c7d75e55cff26f537164d0a573831d0ff850d1

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