Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0cac90feb2f5665…

MALICIOUS

PDF

72.1 KB Created: 2021-06-12 15:11:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 91234c1b8c3cfb81ebabfe2fda05213e SHA-1: cc8cfbc7ec72508fbb96b6acdeacf132bcbe1ed4 SHA-256: c0cac90feb2f566515851429eca161d8fe0fab4cec6de780343d244bdef718b7
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a link farm, identified by heuristics as a potential link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO abuse. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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=pc+parts+and+functions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426558/normal_60689f14a4583.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369525/normal_5fc97a46ea8a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418166/normal_5fe68c6c23824.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383571/normal_5fe83cd3a6aef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493198/normal_60beeb2707b54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454425/normal_600db24294c57.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401732/normal_6000551f8d879.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448976/normal_60122129d0e06.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3baead9-e4a1-4457-9003-e2324bc8c162/neil_degrasse_tyson_puts_jeff_bezos_net_worth_into_perspective.pdfIn PDF document text
    • http://botinuba.pbworks.com/f/rolabobuliwew.pdfIn PDF document text
    • http://biribivit.pbworks.com/f/does_vinyl_plank_flooring_contain_asbestos.pdfIn PDF document text
    • http://diruzonedod.pbworks.com/w/file/fetch/145190115/86086501731.pdfIn PDF document text
    • http://vatojorisa.pbworks.com/w/file/fetch/144434910/what_is_alphatrak_control_solution.pdfIn PDF document text
    • http://vadibun.pbworks.com/f/88072638307.pdfIn PDF document text
    • http://ziludezubeju.pbworks.com/w/file/fetch/144906009/87616432738.pdfIn PDF document text
    • http://fevosezew.pbworks.com/f/3716045845.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa9c2a66-30cd-4774-b3a4-07b5a1ea697e/royal_caribbean_alcohol_package_limit.pdfIn PDF document text
    • http://lilofebuful.pbworks.com/w/file/fetch/144773526/26720730533.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7ea51ba-f34d-4aeb-986c-86c0288c15d3/justin_guitar_music_theory_free.pdfIn PDF document text
    • http://xutosop.pbworks.com/w/file/fetch/144458433/dosis_de_metamizol_en_nios_iv.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://commons.wikimedia.orgIn 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_off0000dbbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBB 5116 bytes
SHA-256: 57d2ba3aee44023667a666df9a9ef2e47543a6c06fb924126157dd5e30f7969a
font_01_sfnt_off0000ed2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2F 10872 bytes
SHA-256: 27a89a20d71b2e2caa9a718da4c18832ea1550cd2ca421ec7918a106a931d169

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