Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b61138529ccd2c6…

MALICIOUS

PDF

72.9 KB Created: 2021-02-27 18:17:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 3cb95929ed8f446840c3ac292713d997 SHA-1: d173edf7f525751cd8da8ba2ef8a60ef561dd2d0 SHA-256: 3b61138529ccd2c68dbf9522b4c77a8b88c0e983c50d898a9642daa1539ded41
126 Risk Score

Malware Insights

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

The file is a PDF document flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm or redirection mechanism to host malicious content. The document body, though heavily obfuscated, contains text related to workout stretching, likely a lure to disguise the malicious intent.

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://seumenha.ru/123?utm_term=how+to+stretch+after+a+full+body+workout PDF link annotation
    • http://munasimowijuxi.getenjoyment.net/top_interior_design_schools_in_pune.pdfIn PDF document text
    • http://komaxinatobofe.medianewsonline.com/kijuxi.pdfIn PDF document text
    • http://medazuxa.mywebcommunity.org/90501094821.pdfIn PDF document text
    • https://wosabizovores.weebly.com/uploads/1/3/4/5/134577485/vapuj.pdfIn PDF document text
    • http://sawemawe.mywebcommunity.org/bunuxidaxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498971/normal_5fd941ccbe45d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380084/normal_5fe1011f59e42.pdfIn PDF document text
    • https://xejinifinedi.weebly.com/uploads/1/3/5/3/135305438/kopiporuj_natijo_vodozifu_rejabisizo.pdfIn PDF document text
    • https://simalono.weebly.com/uploads/1/3/1/8/131856945/zubuli.pdfIn PDF document text
    • http://lunatan.medianewsonline.com/which_pokemon_game_is_the_best_for_ds.pdfIn PDF document text
    • http://balifruit.com/tutorial_autodock_vinaim4qq.pdfIn PDF document text
    • http://bcpzonasegura10beta-viabcp.com/big_space_calendar_templatejoucm.pdfIn PDF document text
    • https://rirejanumaxix.weebly.com/uploads/1/3/4/6/134631236/662e46.pdfIn PDF document text
    • http://madoxorijegobe.sportsontheweb.net/panurolin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fajazimigig.atwebpages.com/typewriter_repair_in_redding_california.pdfIn PDF document text
    • http://gurabagoderes.atwebpages.com/how_to_fix_sewing_machine_stitch.pdfIn PDF document text
    • http://feferabi.atwebpages.com/twilight_eclipse_cast_seth_clearwater.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_off0000dec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC6 5468 bytes
SHA-256: 370066b922378e08077b274aef663bb2d6fc64592e3d2f732e605d79d2d79fb5
font_01_sfnt_off0000f172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF172 10912 bytes
SHA-256: 19cbf804be0d17dbd2790e6c6d192d6279e112ae12e1c65543ebb09d9878ef2e

Open this report in the interactive analyzer, or submit your own file for analysis.