Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e603a04ee5af4ea…

MALICIOUS

PDF

80.1 KB Created: 2021-02-12 19:46:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 728b8f26b38835468f61c4b4218ac0aa SHA-1: f3251c020f36e678a59dd022f6bc1cd4622559cb SHA-256: 2e603a04ee5af4ea2d8a71ec5c4e88acbe3c9f004df99a25f802317ae340ec72
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically pointing to 'bologen.ru' and disguised as a game guide. Heuristics indicate this PDF is part of a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate 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://bologen.ru/wix?keyword=dragon+nest+leveling+guide+1-60 PDF link annotation
    • https://cdn.sqhk.co/tupujokuz/cE5rEx3/spinner_io_mod_apk_revdl.pdfIn PDF document text
    • https://cdn.sqhk.co/wavefekus/hiahfF0/sports_tracker_running_cycling_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/lofakekaf/Mc9gigi/91349014197.pdfIn PDF document text
    • http://todegapevaja.iblogger.org/vb._net_2010_professional.pdfIn PDF document text
    • https://cdn.sqhk.co/tefupudoma/Ahhiahh/menuvirasekupegewamasotun.pdfIn PDF document text
    • https://cdn.sqhk.co/jisanipu/hhdTHjg/learn_to_sew_patterns_free.pdfIn PDF document text
    • https://cdn.sqhk.co/vumivatuvi/c78uGji/centipede_retro_game_unblocked.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450048/normal_5fe53ba07972b.pdfIn PDF document text
    • http://zelafagilu.iblogger.org/lebesilodixodawelunarasiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479933/normal_60229fd81aa11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386606/normal_601b953d081c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426810/normal_5fddbc5887fb3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lomogas/17570877570.pdfIn PDF document text
    • https://s3.amazonaws.com/wupagivoz/sanixajoz.pdfIn PDF document text
    • http://mewuxizu.rf.gd/skype_7._41_offline_installer.pdfIn PDF document text
    • http://pijopatamotawu.epizy.com/tagipijetorom.pdfIn PDF document text
    • http://zusewijoje.epizy.com/jumble_chicago_tribune_answers.pdfIn PDF document text
    • http://dezoruxeg.epizy.com/aghori_baba_photo_free.pdfIn PDF document text
    • http://vezoxonu.epizy.com/nobreak_apc_back-_ups_pro_1000_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxuledo/push_notification_android_firebase_example.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_off0000fc00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC00 5432 bytes
SHA-256: ba1a517f867adf3db14957712b0a96cfde2bafa3be8ed88b40f08a4ccca518b9
font_01_sfnt_off00010e9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9E 10700 bytes
SHA-256: c6696d300720b02db67bc62eb451b72cd6d9e44a621462c26869638ffb2cf976

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