Malicious PDF — malware analysis report

Static analysis result for SHA-256 963499c2982849cc…

MALICIOUS

PDF

77.5 KB Created: 2021-03-10 12:15:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 15d0d2ca9faa391e166f231a0f170010 SHA-1: 9a5a2b98f1ae28e7d7567efbba46a0ce140fb9ee SHA-256: 963499c2982849cc8acfe367947a8dfc64b09b6d97ff25d516e5296bbd80af52
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 0.9998

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://leonvi.ru/award?keyword=ordem+dos+adjetivos+em+ingles+pdf PDF link annotation
    • http://samo-katim.ru/9729872645795rr3.pdfIn PDF document text
    • http://choosenews.space/xowagugogaxiq73u.pdfIn PDF document text
    • http://hydra.moscow/21885367678yyym3.pdfIn PDF document text
    • http://onsideball.info/94943500218z21zi.pdfIn PDF document text
    • http://creditscoreusa.info/classroom_management_plan_template_docvyq00.pdfIn PDF document text
    • https://cdn.sqhk.co/petawelesup/Cfhi7wT/fejit.pdfIn PDF document text
    • https://cdn.sqhk.co/rusobotakox/ihgDhaI/acrylic_nail_designs_pink_glitter.pdfIn PDF document text
    • http://all-system7.club/student_attendance_management_system_project_reportsgwbv.pdfIn PDF document text
    • http://ing-cliente.com/ata_chapter_25dkor8.pdfIn PDF document text
    • http://astropsychology.website/how_to_barre_chords_easiera825a.pdfIn PDF document text
    • http://drive4mclaneeffingham.com/george_foreman_electric_indoor_outdoor_bbq_grill_reviewsqe8gk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://89f68ddc-9f98-4e60-8afa-3e0ca6603e9e.filesusr.com/ugd/4725f1_e781d5d8b51f4a94b05cd98294824779.pdf?index=trueIn PDF document text
    • https://4a39c6c9-989b-4d11-b2d8-cc0becc7f193.filesusr.com/ugd/ef0078_81e4b46e587e4188a91e10e164cf1634.pdf?index=trueIn PDF document text
    • http://jizagedades.rf.gd/select_formally_approve_crossword_clue.pdfIn PDF document text
    • https://ea64ff4c-51e6-4efc-8cc1-399682447901.filesusr.com/ugd/961f18_be94ac9119bf462485c653028a75232a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/dajuvipimitugutiterowesoj.pdfIn PDF document text
    • https://s3.amazonaws.com/gazitif/65215168919.pdfIn PDF document text
    • https://a32e93c2-1aa3-4149-af29-aa5d163ab988.filesusr.com/ugd/40336e_23a82620ba804c8081d9401cbc5ac2a1.pdf?index=trueIn PDF document text
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_acda2ca9f0494f1b8f5d1d99ea30a049.pdf?index=trueIn PDF document text
    • http://fesenobonirizu.epizy.com/87564151441.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_off0000ecfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFA 5524 bytes
SHA-256: 3eac4002f13aecfd5c8923495137a80b327cd5e77fdb7a3cf32c9cedecd2b164
font_01_sfnt_off0000ffbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBD 12820 bytes
SHA-256: 06da20ea4e75e3cd0c2bb64d86bd93d78f723e1fe68716786a56fd0ef8d33873

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