Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e0210033b03e305…

MALICIOUS

PDF

72.0 KB Created: 2021-03-16 15:47:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 79195d6bf413c1a7f4b367610019860b SHA-1: 2c4cf23e12ee5c988883d144fa8d40cb8a25bf00 SHA-256: 2e0210033b03e305968414f7ecabab4eb2e9cde48596d408ee79c8d21c34e10e
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with one specifically pointing to a suspicious domain ('kuzutuzo.ru') that is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL distribution suggest it's designed to redirect users to malicious content.

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
  • 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://kuzutuzo.ru/strik?utm_term=sig+sauer+p226+airsoft+spring+magazine PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4495691/normal_6046cbc93dd92.pdfIn PDF document text
    • https://cdn.sqhk.co/zuzememub/hfFgghe/84455798654.pdfIn PDF document text
    • https://cdn.sqhk.co/duzupafuj/big0iaB/loud_sound_ringtone_free_download.pdfIn PDF document text
    • http://memaberenux.scienceontheweb.net/planification_et_amnagement_du_territoire.pdfIn PDF document text
    • https://cdn.sqhk.co/zofizitene/bwgeEja/tiguboli.pdfIn PDF document text
    • https://cdn.sqhk.co/nadipozow/d6uFMis/stickman_fight_knife_hit_game.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499021/normal_5ffe6d117bd8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479223/normal_604ebb09813e3.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/e6f8689e-79c8-4ad2-94cf-2611b938d5e0/who_are_the_actors_in_the_house_with_the_clock_in_its_walls.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/brine_shrimp_ap_bio_lab_answers.pdfIn PDF document text
    • https://5b5cf7c4-d983-4e27-bd54-44d52fc9074e.filesusr.com/ugd/2f9450_934aaf8909034539888198d67a398061.pdf?index=trueIn PDF document text
    • http://kuwitabetegipo.myartsonline.com/cateter_mahurkar_tecnica.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/bijli_mitra_app.pdfIn PDF document text
    • https://1058d175-53f8-4d86-9201-ae9c1fc74009.filesusr.com/ugd/62a633_093716feafbe4f2cba181307aa917132.pdf?index=trueIn PDF document text
    • https://3568c1c9-c281-4b9a-9ea9-d5d291e0176b.filesusr.com/ugd/e5d8db_85d20b57bcf34837bfe37948e1e4b493.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/383823ed-330e-48b0-a873-422401c47f9f/53797171095.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40c544e2-92af-4c62-ad35-4b49048c513e/how_to_become_a_millionaire_with_rental_property.pdfIn PDF document text
    • https://cf2e1f24-e5f1-4289-9567-3affce9c164e.filesusr.com/ugd/a4ea6c_d5bd73f0ecbb466ba8d9020970fb6e4a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fcf0b77-157d-4f3e-8d03-4f0983953370/past_simple_past_continuous_online_exercises_multiple_choice.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_off0000d8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EF 5628 bytes
SHA-256: 8f6165c6d4c4e9cd9257b2af0d4373d4169504ea5e87c6aee13a919615f6d9b9
font_01_sfnt_off0000ec0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0D 12880 bytes
SHA-256: 6162e4a0985033c354c98a85a01eb2e2f9358600706e6c2d2b67d94e088da1f5

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