Malicious PDF — malware analysis report

Static analysis result for SHA-256 345f5dcda43d8c68…

MALICIOUS

PDF

87.0 KB Created: 2021-02-26 05:09:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 102d96d68d78bede90f56fe5d0973fc1 SHA-1: 78fc70a6a04853e098be79112d9f50c033732245 SHA-256: 345f5dcda43d8c6837ffc041438be54272efe83633346902a88398f809b546b4
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and form a link farm, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains keywords related to medical anatomy and physiology, likely serving as a lure.

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://druttle.ru/award?keyword=medical+anatomy+and+physiology+book
    • https://cdn.sqhk.co/xedomobedusi/DwgiHha/throne_of_eldraine_promo_price_list.pdf
    • http://tafugegajotu.mygamesonline.org/navy_e1-e6_evaluation.pdf
    • https://cdn.sqhk.co/towinomer/djbjijg/lugewobebuvi.pdf
    • http://jojidasusesot.sportsontheweb.net/44302621960.pdf
    • http://pazifelurup.medianewsonline.com/gonunojawitofaru.pdf
    • http://kutatit.getenjoyment.net/xatukatasawagokexojazu.pdf
    • https://cdn.sqhk.co/silinetufid/fYeOmhd/55797274750.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://livirava.atwebpages.com/what_do_the_lights_on_my_arris_surfboard_mean.pdf
    • http://tiluxusimutine.atwebpages.com/59570021728.pdf
    • http://gafodix.myartsonline.com/list_of_best_inorganic_chemistry_books.pdf
    • http://nabenejajoko.myartsonline.com/raxoselewubitim.pdf
    • http://gurabagoderes.atwebpages.com/pentair_triton_ii_tr60_laterals.pdf
    • http://bivojeda.atwebpages.com/nururorafizeduvapope.pdf
    • https://s3.amazonaws.com/lukepepe/bopil.pdf
    • https://s3.amazonaws.com/zijivevip/55202100821.pdf
    • http://gosaduzunake.myartsonline.com/59404482266.pdf
    • https://s3.amazonaws.com/pibajuwi/vuxizaresalilovus.pdf
    • http://nufiwimuzobo.onlinewebshop.net/nascla_contractors_guide_tennessee.pdf
    • https://s3.amazonaws.com/xokebore/sujofetafovaji.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001172f.bin
897d97577efe61085965e6fa9da15074f1eb6ae21e8d129e0821dbdd063cd1c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1172F 5704 bytes
font_01_sfnt_off00012a88.bin
875d2376f2643db68e8deff0183ce61208f5bacbf211909615df34b33d1bdd5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A88 10512 bytes

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