Malicious PDF — malware analysis report

Static analysis result for SHA-256 22de18085d6f5554…

MALICIOUS

PDF

84.1 KB Created: 2021-04-02 10:37:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a2aaac3db11bfea00a2c6c88023d1811 SHA-1: 5f903e4c72bf68bc1fa33d1e8c0d7b7c11fe8e28 SHA-256: 22de18085d6f5554dfbe8269b58f4d52d5026559ffb99f27fc3a13cf39431344
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://pelibifir.ru/strik?utm_term=what+are+the+skills+required+for+customer+service+manager PDF link annotation
    • http://pusaburuku.22web.org/understanding_evolution_homology_and_analogy_worksheet_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/xisapabo/iemBbNT/61291814464.pdfIn PDF document text
    • http://gakajunefuvefo.iblogger.org/electrical_engineering_schools_in_texas.pdfIn PDF document text
    • http://regivag.iblogger.org/diablo_2_horadric_cube_rune_upgrades.pdfIn PDF document text
    • https://cdn.sqhk.co/dupamotim/jcChiuG/19462703741.pdfIn PDF document text
    • http://bitcoins-profits.com/57832884541yinsw.pdfIn PDF document text
    • https://cdn.sqhk.co/naveropifo/gjie4jh/falling_waters_state_park_directions.pdfIn PDF document text
    • http://kino-vezde.ru/94865783471w7vuj.pdfIn PDF document text
    • http://icily.xyz/divergent_full_movie_download_in_tamil_dubbed_isaiminirgmz3.pdfIn PDF document text
    • http://salea.site/the_joy_of_less_journalq5dfj.pdfIn PDF document text
    • http://xuxevifitadizer.iblogger.org/99462382876.pdfIn PDF document text
    • https://cdn.sqhk.co/lapefuxolu/VjPXIhQ/monir.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/buponuwebi/63230590798.pdfIn PDF document text
    • https://f27bca7f-571c-471d-9e77-92385e6dfcd0.filesusr.com/ugd/9a0fa1_8b92f9e9ee9049a197cb3e004c728801.pdf?index=trueIn PDF document text
    • http://besapiru.rf.gd/janutilotifawunevomigoruf.pdfIn PDF document text
    • https://c81c1a69-aec6-471c-ac34-7a6800eafc69.filesusr.com/ugd/9ef1ea_bf67806393954291a9d3800ac38df52a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/warapagefasovi/bafumu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD32 5580 bytes
SHA-256: dec2fa71bafa7e95d0c853adaf0750f18abda70d116a2c196ed090de57c70d96
font_01_sfnt_off0001100d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100D 10584 bytes
SHA-256: eb5f79e8923d08c79274905f7b993bd9b56c0350789fc190c7d4d426565462c6
font_02_sfnt_off00013458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13458 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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