Malicious PDF — malware analysis report

Static analysis result for SHA-256 29458d4b9b637928…

MALICIOUS

PDF

76.6 KB Created: 2021-06-09 18:11:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 55af39725ccebebe70849a8c5e2e4f6e SHA-1: 5e8af062215535c9a6dfc0a2513433040d2cf649 SHA-256: 29458d4b9b637928b738e073732d4dbfc481b45d0f330534871c16768777d1d0
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is designed to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

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://garglob.ru/pbw?utm_term=brooklyn+nine+nine+worst+character PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4446280/normal_5fdebca34a528.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447888/normal_6069dc583a3a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378836/normal_5fe8c9522b93e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414689/normal_5fccb3659b5cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376359/normal_603fcaf9e16bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459320/normal_60254059586e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488102/normal_5fd078216b17d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490528/normal_5fda203a18667.pdfIn PDF document text
    • https://tugupititu.weebly.com/uploads/1/3/4/8/134887320/7752761.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413846/normal_5ffc2cb846682.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369788/normal_605464bf61982.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490376/normal_6016ff5e2c259.pdfIn PDF document text
    • https://sofofiwolasaxu.weebly.com/uploads/1/3/1/8/131856039/daranobifijon-kulupawe-vafobijepubize-betinoni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406169/normal_60248c0279b7a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://genarozep.pbworks.com/f/guia_de_comprension_lectora_tercero_basico_word.pdfIn PDF document text
    • http://niwomif.pbworks.com/w/file/fetch/144427560/nofazale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4d5b6ed-72fe-4387-9168-e807aca9c4d2/puraxupuz.pdfIn PDF document text
    • http://nawujewo.pbworks.com/f/how_to_install_sketchup_2020_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbb520ed-b915-4295-8a68-cabb0f311c3b/48800428733.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/359db143-c9a3-4891-ae85-b5c8448079c8/xoselakipatimu.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_off0000edf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF1 5192 bytes
SHA-256: 66e206ea22f421a6fd72fa23f8fa4132f4558aabbb8a48b9aaccf48cee23d80e
font_01_sfnt_off0000ffb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB5 10720 bytes
SHA-256: a52a45386086453f547eb61fca31eeb10f4e9e9b8c89b6b828bcfc61e73790c2