Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c28eb7cfbf8c4f7…

MALICIOUS

PDF

79.4 KB Created: 2021-03-09 01:06:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f8caaf641473e21fc056d1f537ab0d13 SHA-1: 988ea3c0be1a312b2a87cabcc8b3a86387b96435 SHA-256: 3c28eb7cfbf8c4f7d285139a0ec0e2452db2af1c12ce5984c4d4f4163be926c8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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=erase+google+search+history+android PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384822/normal_6045130a3c84a.pdfIn PDF document text
    • http://carbackseat.site/nhs_barnsley_ccg_annual_reportiolta.pdfIn PDF document text
    • https://cdn.sqhk.co/nenuguvan/chbG8xk/my_singing_monsters_action_figures_series_2.pdfIn PDF document text
    • https://cdn.sqhk.co/ragejeli/ggEhakD/prison_break_season_4_ending.pdfIn PDF document text
    • http://voicebftyi.com/100_idiomatic_expressions_for_ieltsxuwef.pdfIn PDF document text
    • http://goromeo.club/blue_background_for_baby_boy_freef6227.pdfIn PDF document text
    • https://cdn.sqhk.co/vabalogu/bWjgRic/zarchiver_donate_apk_mod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485014/normal_60222f4b1e1a5.pdfIn PDF document text
    • https://cdn.sqhk.co/roratumopiv/dZEhcgi/mikafenikamodogudexani.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/753ad06e-e7a4-486f-ba8b-1662abe49155/bililojanirali.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/651f203f-b52b-4a40-a96b-ccbf1efef7e8/nuxukufivufok.pdfIn PDF document text
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_9a612d982d8f4f35a6eaccdae27bfc67.pdf?index=trueIn PDF document text
    • https://f3ea461b-95fd-44cf-949c-5afda193840f.filesusr.com/ugd/a48928_6144e1a03a5d4d65b5e3791b04c690ee.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/61cc45df-232f-456f-8174-472bbf705b2f/gefifumul.pdfIn PDF document text
    • https://0e733887-fd72-4d21-8b10-0a39cafbc931.filesusr.com/ugd/1e4d10_a02c84ee258843c1b4a4ca0c0b9a2be9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wizedumi/sfdc_report_filter_logic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/507fb808-af27-4045-b602-ef1ba34de812/pokuzi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42b9c949-2f52-4bb3-8103-254d4dac6791/past_perfect_progressive_tense_worksheet_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/22734999103.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/toferakonifawobes.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/que_es_estado_de_derecho_social.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/minecraft_pe_mods_free.pdfIn PDF document text
    • https://9fd4a267-a675-4462-b2a8-34848e7262be.filesusr.com/ugd/3835dd_ec848d75ec5e477c8f656f588ec1ded3.pdf?index=trueIn PDF document text
    • https://a519209a-2b0a-481f-9fe9-460c873bdc80.filesusr.com/ugd/270e53_d16522a0534242d0a9acfc94cd07b89d.pdf?index=trueIn 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_off0000fa69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA69 5260 bytes
SHA-256: f8ab80c0f2b5666af5e71ddabba466517b894ccaffd43f4a5880b2f43d022001
font_01_sfnt_off00010c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C47 10308 bytes
SHA-256: 1c22ee8c56de3b779e6464e7b3de3e2b9e194c8687f38a21e11b72fe18e0c542