Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9f1833a4296900f…

MALICIOUS

PDF

76.8 KB Created: 2021-04-04 01:32:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7da9bac65b2076107ea86b120b1a956a SHA-1: 1ac2d4863e51750d75e312f201235b2dc17af3ae SHA-256: a9f1833a4296900f35f2b668c1c04f6b7fc83c82da678c7ea665f2c75f574a22
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/award?keyword=10th+class+maths+book+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450424/normal_6040fb72cb2b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366063/normal_6043e6740fe46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422637/normal_601a0790ce564.pdfIn PDF document text
    • http://zomewegi.iblogger.org/rovurozekow.pdfIn PDF document text
    • http://wumewil.sportsontheweb.net/eu_gmp_annex_1_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366312/normal_605ee14d13757.pdfIn PDF document text
    • http://jaraxusej.iblogger.org/que_es_un_anuncio_publicitario.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413973/normal_6058476f16750.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448346/normal_60331935e4dc0.pdfIn PDF document text
    • http://bazunujovi.scienceontheweb.net/vufavulovi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465250/normal_5fda222ca860d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459188/normal_5fcb1213bc263.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368497/normal_605a11dde74c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487413/normal_5ff2233e6d8b4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kevawiposiwa.rf.gd/fourier_analysis_introduction.pdfIn PDF document text
    • http://mopawok.epizy.com/16783747077.pdfIn PDF document text
    • http://bulalejovadidov.rf.gd/32414563617.pdfIn PDF document text
    • http://rivuwasiwitovud.rf.gd/physiology_of_muscle_growth.pdfIn PDF document text
    • http://lemujiv.epizy.com/background_png_hd_free.pdfIn PDF document text
    • http://naremijex.epizy.com/tweakbox_best_app_er.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FD 5316 bytes
SHA-256: fa09e228bb7fa470f6efa64da7738fbe97eaa5210e3bfddaec8c04abf05acfbc
font_01_sfnt_off0000f2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EF 10896 bytes
SHA-256: 402d06b6859e1916f233d9eddd229e7a69bbdd5d820c7783d51de1aa1a40af74
font_02_sfnt_off000117d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D7 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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