Malicious PDF — malware analysis report

Static analysis result for SHA-256 b21ae35d0f2d2f01…

MALICIOUS

PDF

73.6 KB Created: 2021-04-10 13:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 80908fd2affdbf4f80b8b2c17576d30f SHA-1: 2350e2c02e763c735c759b794ce6758b52bed045 SHA-256: b21ae35d0f2d2f01222b56f71685b3e35e729688f6d5b9cc451328ae847e4d8d
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-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://dugedepap.ru/strik?utm_term=5th+wave+summary+book PDF link annotation
    • https://cdn.sqhk.co/ridijafugemi/q8igcia/fopilovi.pdfIn PDF document text
    • https://cdn.sqhk.co/futogifoku/5hegcnK/online_basketball_betting_sites.pdfIn PDF document text
    • https://cdn.sqhk.co/vunalogivefu/gcgjphb/ice_princess_2_reaching_for_heaven_full_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/pasojixaju/dlWk9dE/minigerakerugib.pdfIn PDF document text
    • http://mivibowefumar.iblogger.org/84286096347.pdfIn PDF document text
    • https://cdn.sqhk.co/fujalapevame/aKohcml/praise_and_worship_gospel_songs_2018.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nonabafat/listening_comprehension_passages_with_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55cedbe4-e173-4fe6-8d7b-4e008fa3f386/2004_ford_focus_repair_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c66fd6d2-c2b3-4376-94a0-609a8e5b5151/honda_3000_generator_maintenance.pdfIn PDF document text
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_ebdd6f01014c46d6acadd186923bcc38.pdf?index=trueIn PDF document text
    • https://61249681-e2d1-4375-841a-b3723294d79c.filesusr.com/ugd/3d514e_1bc19fa717f54511a6a8ff87c2a1cdab.pdf?index=trueIn PDF document text
    • http://jiresigotapikeb.rf.gd/viruses_and_other_malicious_code.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/causas_y_consecuencias_del_alzheimer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3464c79c-5141-4ad4-b18c-ae66c5d01c65/how_to_manage_yourself_better.pdfIn PDF document text
    • https://e3c65705-3664-417e-97b1-2ac29bfab8bd.filesusr.com/ugd/6a5da5_129b33f108824cd3980e61a04e481a9b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/enzyme_liver_lab_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/874a6b5e-8262-4b7d-a7fa-bbb6aefd621f/beziz.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_off0000e0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CC 5380 bytes
SHA-256: d5bc878b08d6b1d7de2983d5f12dbbdced84e427d2f50ec87dcbb11c92b0e419
font_01_sfnt_off0000f309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF309 11492 bytes
SHA-256: b5c2e2d24298f1388cc8691ffb31fb160056fe0f7b51824279d6f918fe6ddb7b

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