Malicious PDF — malware analysis report

Static analysis result for SHA-256 08b21ef39a584cd4…

MALICIOUS

PDF

71.3 KB Created: 2021-01-31 23:07:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 7f8c8e5b1c3c159c3d7965dca81b6649 SHA-1: c22dc88298012cbbbff84a757753a7152404b152 SHA-256: 08b21ef39a584cd442fa2c98b6057a03eb3c1b99312297488977b7e0c640d112
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan PDF. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic for distributing malicious content or phishing.

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://seumenha.ru/123?utm_term=943+area+code+canada PDF link annotation
    • http://wowmarket.info/fubavuvilakexosanudulibklke.pdfIn PDF document text
    • http://mifilud.iblogger.org/chevy_cruze_2018_owners_manual.pdfIn PDF document text
    • http://lolkek.xyz/download_tutorial_blender_bahasa_indonesiahs963.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxudofexal/ib2iihe/gagotinati.pdfIn PDF document text
    • http://freefire-gifts.com/82745700475rbsq0.pdfIn PDF document text
    • https://cdn.sqhk.co/tovisegag/fjeichb/81952570147.pdfIn PDF document text
    • https://cdn.sqhk.co/lezenelu/7kOOlvO/24597251998.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxovunevo/c7Igghb/7022467518.pdfIn PDF document text
    • http://kunabote.22web.org/lolesunigexis.pdfIn PDF document text
    • http://gasiwine.iblogger.org/les_coliformes_fcaux.pdfIn PDF document text
    • http://perevod24-card2card.site/music_instrument_store_near_me_nowsfyq5.pdfIn PDF document text
    • https://cdn.sqhk.co/namulofilox/ibNihjd/98876484725.pdfIn PDF document text
    • https://cdn.sqhk.co/lojosexotak/keTheNP/xasusasedew.pdfIn PDF document text
    • https://cdn.sqhk.co/lozuzupadis/5hiHhiB/ludo_superstar_pro_apk.pdfIn PDF document text
    • https://zeloruzo.weebly.com/uploads/1/3/5/3/135349371/gumilobopexatune.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wagivuxofoz.rf.gd/assessment_strategies_formative_and_summative.pdfIn PDF document text
    • http://retudazugo.rf.gd/marching_season_yanni_sheet_music.pdfIn PDF document text
    • http://besikinugid.epizy.com/bloons_tower_defense_5_hacked.pdfIn PDF document text
    • http://nujafosedoke.epizy.com/muxawolevidirujipadevug.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_off0000da68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA68 5036 bytes
SHA-256: f81a94e49b69d517648158a93cb439bd56e4f9900df0fe4fa64378edaf22dc35
font_01_sfnt_off0000eb92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB92 10784 bytes
SHA-256: b141f1e006271b9374a849636fc440ae6aa616aad1e1015c8c261ad457ee9394

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