Malicious PDF — malware analysis report

Static analysis result for SHA-256 da08109c2d89e043…

MALICIOUS

PDF

82.2 KB Created: 2021-06-07 09:51:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b566e44d351df2976e6b4f979675ef75 SHA-1: 20742048fa971b7b4b7c95cd970f388505473ba5 SHA-256: da08109c2d89e043a6493e4afc7df983f59aea434bdedc2a7d53c460927b5007
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. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The primary URL, https://catamma.ru/pbw?utm_term=dog+simulator+3d+unblocked+games, is likely part of a phishing or malware distribution scheme. No scripts were extracted, but the PDF structure and numerous external links indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/pbw?utm_term=dog+simulator+3d+unblocked+games PDF link annotation
    • https://bibatuzasofobi.weebly.com/uploads/1/3/4/8/134879938/f7f042d24c97a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379960/normal_600320a64475c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455375/normal_5fee752a1c913.pdfIn PDF document text
    • https://xusofudubivo.weebly.com/uploads/1/3/0/7/130775679/mifadewamag-tekonupene-fabusagikixabe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462354/normal_605f2ff076f0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368503/normal_6064802d83941.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470380/normal_602a176f1f801.pdfIn PDF document text
    • https://xojexibawetu.weebly.com/uploads/1/3/4/3/134361221/goxiduxamepid.pdfIn PDF document text
    • https://vinetiwufo.weebly.com/uploads/1/3/5/3/135305890/voduzom_kisemugofewofas_magedokivisipi.pdfIn PDF document text
    • https://mesajenijapab.weebly.com/uploads/1/3/0/9/130969967/69df4ee93d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459805/normal_600b2153dc1f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412909/normal_60466344163fb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409243/normal_5ff8831886165.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dijakezepo.pbworks.com/w/file/fetch/144469959/57541702814.pdfIn PDF document text
    • http://wezenibafasi.pbworks.com/f/vidmate_install_pc_free_download.pdfIn PDF document text
    • http://tujedet.pbworks.com/f/57571931053.pdfIn PDF document text
    • http://vibuvedatixi.pbworks.com/w/file/fetch/144732192/mibanagetositepuremamob.pdfIn PDF document text
    • http://zeranagaro.pbworks.com/w/file/fetch/144711930/extreme_car_driving_simulator_gioco_online.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_off000101b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B8 5624 bytes
SHA-256: ca8bcad1a39b4dd0e03f193c1a510f5d0a74dbcd8f03c1f4797ab658f1df9830
font_01_sfnt_off000114cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CC 11316 bytes
SHA-256: f1af88e5fa4aa5d89951678e2bc3b6b7b3442fd1735dbb68ffb070d2ea560ffa

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