Malicious PDF — malware analysis report

Static analysis result for SHA-256 75a7a81db0b6f2b2…

MALICIOUS

PDF

82.4 KB Created: 2021-03-02 17:44:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 692a9f8344f6311d248a5185eff81797 SHA-1: 7813483e4544f7a00036d3e5f937210e8f662e53 SHA-256: 75a7a81db0b6f2b2cdda533be250fc8f5689118f14584d22639d439c584a0d3e
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to a dartboard manual.

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://ponafet.ru/strik?utm_term=arachnid+bullshooter+dart+board+manual PDF link annotation
    • http://ukranews.site/a__p_john_updike_summary_analysis2v33e.pdfIn PDF document text
    • http://somixewavado.sportsontheweb.net/29476092391.pdfIn PDF document text
    • http://saveyoutubebot.com/importance_of_value_education_in_our_life_essayswzg1.pdfIn PDF document text
    • http://vizit.store/12331961577z36xn.pdfIn PDF document text
    • https://cdn.sqhk.co/gepumenujeme/LgjBhiO/95193866854.pdfIn PDF document text
    • http://casbah2point0.com/wupabunideladidistnh1j.pdfIn PDF document text
    • https://zidovularirijap.weebly.com/uploads/1/3/4/7/134718784/vipibinobokof.pdfIn PDF document text
    • http://razvivatel.blog/trail_climb_mod_apk_revdlata1p.pdfIn PDF document text
    • https://cdn.sqhk.co/nejijilo/gjiNor2/47128025723.pdfIn PDF document text
    • http://finonit.mypressonline.com/taparekeboxi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486971/normal_5fdee768b5343.pdfIn PDF document text
    • http://shoppermarket.online/zesufoberazaxudebuvotibenjh16.pdfIn PDF document text
    • http://gatowixipeba.mywebcommunity.org/julius_caesar_act_1_scene_2_study_questions.pdfIn PDF document text
    • http://rigoditibalun.mywebcommunity.org/how_big_of_a_room_will_12000_btu_cool.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000104eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EB 5308 bytes
SHA-256: e8de2e062b20a1c6d4d732c0eb3518ad154f7988d8ddb35bd3ca3128ebaf5692
font_01_sfnt_off000116c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C1 11188 bytes
SHA-256: bee9006f94ca6dd9a98bc4ee5346c1b1d95f597b15fd6c22e1f9ca8d4800152f

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