Malicious PDF — malware analysis report

Static analysis result for SHA-256 6608b3c5c48d2d49…

MALICIOUS

PDF

67.9 KB Created: 2021-03-25 09:07:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a9434dd06f1b75b60ad697f7054c197e SHA-1: f26d2bb3656f0b375219cdac40d632be9d7534e9 SHA-256: 6608b3c5c48d2d491af4524898352702d8beb7c6840a8885ffb1efee818c53e2
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous external links, with one prominent URL pointing to a link farm on disposable hosting, disguised with a search term related to textbook answers. The presence of embedded URLs and the nature of the heuristics suggest this document is designed to redirect users to malicious sites, likely for phishing or malware distribution.

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://seumenha.ru/123?utm_term=prentice+hall+chemistry+textbook+answers+pdf PDF link annotation
    • https://detosujedeke.weebly.com/uploads/1/3/4/3/134371576/12d5cc.pdfIn PDF document text
    • https://xuxasogunoniku.weebly.com/uploads/1/3/1/8/131856570/1241937d37.pdfIn PDF document text
    • https://cdn.sqhk.co/pefisemise/ijcMFgh/nigijalujirabakuverovelaw.pdfIn PDF document text
    • https://jalaxogazumin.weebly.com/uploads/1/3/4/3/134373329/vonoboraviw_nuvarinefaru_numejedisoka_suvox.pdfIn PDF document text
    • https://cdn.sqhk.co/xegapanasa/hj5ieig/wings_financial_apple_valley_address.pdfIn PDF document text
    • https://cdn.sqhk.co/savageven/ijgBDjh/entrar_revolico_motos_jawa.pdfIn PDF document text
    • https://dodukitomot.weebly.com/uploads/1/3/1/4/131407143/8899207.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://35057dd6-1d18-4acd-96c9-af3b7fddc7cd.filesusr.com/ugd/978dd5_ff4771e75ff74d7a82c66270f38ca613.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/342008dc-7f86-4c2c-8e24-e26434323b9e/what_do_palo_santo_sticks_do.pdfIn PDF document text
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_ae0d59df108343bd864749194b798d99.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/24711ade-c663-4af4-aab0-1aca8224f158/34304840273.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f32d191-3d06-456a-8dc4-b548701b578c/pemamega.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/971b7eae-082b-4c10-9862-1d1160d88cfc/84524499751.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a42fa612-4256-49f4-b681-60f50ffc430c/kilenufivevawodipopib.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/piboji.pdfIn PDF document text
    • https://s3.amazonaws.com/tadevewuju/quickbooks_audit_trail_report.pdfIn PDF document text
    • https://s3.amazonaws.com/nijudow/11716897421.pdfIn PDF document text
    • https://c6506652-bf5e-4f52-be36-03dbfaede22c.filesusr.com/ugd/f74919_7956cd6d5e2245eb831a3722dfb39537.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/470a768c-297d-4aa5-8a3f-b9dcb090ebb8/how_to_open_jbl_sb400_soundbar.pdfIn PDF document text
    • https://s3.amazonaws.com/wovitiku/103880206.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_off0000cc6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6C 5860 bytes
SHA-256: 04a7db255fba57ad82353651490c0ac5e814afd5fbc4327f449d797f31602e24
font_01_sfnt_off0000e051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE051 9924 bytes
SHA-256: 346593575edff43892e5a0abfbb6a55060633bb63d8757f030c3ffe80c6e0404

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