Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b285866ff1f8667…

MALICIOUS

PDF

80.0 KB Created: 2021-03-17 09:43:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 421e555d9df4807a1bf326dd2c3ee3d7 SHA-1: aef725b285c5978507cb8232cfe3f4166053db22 SHA-256: 4b285866ff1f8667685db0a4dadfb3ffe54505bd031ce587a1b1325fbb9bcdc3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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/wix?keyword=acer+aspire+es1-572-31xl PDF link annotation
    • http://siankaanmexico.com/basic_electrical_and_electronics_engineering_solved_problemsy4tkc.pdfIn PDF document text
    • https://cdn.sqhk.co/nepusoliweda/bFmX0ji/face_mask_detection_github_c.pdfIn PDF document text
    • http://sluzhba1.net/requirement_of_ifc_in_audit_reportwi44d.pdfIn PDF document text
    • http://autocredit.moscow/kuluwifazufidicq74b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415331/normal_5fde13603fcc6.pdfIn PDF document text
    • https://cdn.sqhk.co/birenejar/jjhdpgj/ivry_lane_surgery.pdfIn PDF document text
    • http://vivadoctor.ru/jurnal_penelitian_akuntansi_biaya6wfl2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375086/normal_603ff95e146fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416789/normal_6016a9dfefda7.pdfIn PDF document text
    • http://armlur.space/flysky_fs-gt3c_transmitterfjasv.pdfIn PDF document text
    • https://cdn.sqhk.co/fudamewojaf/jh66jiO/basketball_score_sheet_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414679/normal_602183f04c0f6.pdfIn PDF document text
    • http://sevastopol.sale/how_to_factory_reset_hp_laserjet_p1102wxqgfu.pdfIn PDF document text
    • http://tehnotop.store/water_borne_parasitic_diseases4jjrf.pdfIn PDF document text
    • http://discount50it.pro/82949381418ed073.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/fa07fac5-d3f5-482f-a9b6-939fd314a6f3/alain_badiou_books_list.pdfIn PDF document text
    • https://s3.amazonaws.com/sudevejerifu/8286695901.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/rabatujimalutanos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74016bec-7e5c-4414-bf06-7841ec85d7fd/navy_officer_designator_insignia.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_off0000f876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF876 5568 bytes
SHA-256: f29763ca61fa0e9d79476a3fb62a3e9d3d72026e6ff0577758a88ff31b660554
font_01_sfnt_off00010b91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B91 11708 bytes
SHA-256: 0c059c28a64fe9e264360f0af499368920c648e9447a01a58b5d9f6075c6f909

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