Malicious PDF — malware analysis report

Static analysis result for SHA-256 167b6009b8c6d7c1…

MALICIOUS

PDF

77.5 KB Created: 2021-05-14 19:52:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 25426f97230d68407253b4e260861a3e SHA-1: 97446614ee3825227e109ad048ae9261d09bfe88 SHA-256: 167b6009b8c6d7c1af54e8ef4a0c49ebeb618c56c8486b8b8954598607440911
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least two pointing to known malicious or disposable hosting domains. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a link to 'dafemum.ru' which is associated with redirector infrastructure. The ClamAV detection and ML classifier further support the malicious nature of this PDF, indicating it is likely a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=stannah+stairlift+repair+manual In PDF document text
    • http://solifixogalek.mypressonline.com/business_plan_elements.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413590/normal_5fe9641793421.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388181/normal_604729670205f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411935/normal_605d2f06ee67a.pdfIn PDF document text
    • http://foxilajat.sportsontheweb.net/22845832403.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392871/normal_5ffa5ecf67100.pdfIn PDF document text
    • http://rapoxarawiwalo.sportsontheweb.net/linear_algebra_and_differential_equations_berkeley.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/67548689-3c4d-47b1-a01e-9d33ea8a84e0/nujozelosalowuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03c9d8e5-24a3-4366-9f1d-adf27042cac6/examples_of_descriptive_and_inferential_statistics.pdfIn PDF document text
    • https://09972071-4174-499b-90b1-de3619f59f53.filesusr.com/ugd/d1c05f_024b615b243c4155859c0999240596f9.pdf?index=trueIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_81ecc43b27c74514955a67e5450ec03b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sefukirexuwekij/80060776646.pdfIn PDF document text
    • https://9f53eded-325d-4e02-8430-7c09bd872488.filesusr.com/ugd/e04405_69405817f9934a3e92e3174cf5ac5d55.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/61516308086.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/purujamotoxanoloxufenizis.pdfIn PDF document text
    • https://s3.amazonaws.com/lazolu/mariam_khan_reporting_live_on_hotstar_app.pdfIn PDF document text
    • https://e216d865-ddc7-438b-99b2-64609380b1bb.filesusr.com/ugd/7ae8b3_ef39cfe9e7904a99b3c85c23679c94d6.pdf?index=trueIn PDF document text
    • https://bc3ee532-4344-4262-9f0b-d8353e2229a5.filesusr.com/ugd/6ca3f6_f69bc57542e24d1ebbb7623d6e878c68.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/banco_bicentenario_nueva_plataforma_2018.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_off0000f2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E9 5244 bytes
SHA-256: 44b42ceecacca19fa44b1dfc1249ab6c0790291d0604105c0cc180c081b3cb7c
font_01_sfnt_off00010493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10493 10724 bytes
SHA-256: ceaecadb73ba0ecf48790bc80bd1755da72e23309c1a308b0b615da1024ab02d

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