Malicious PDF — malware analysis report

Static analysis result for SHA-256 924239b3fbc08ead…

MALICIOUS

PDF

93.3 KB Created: 2021-02-23 01:21:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6617e51eb3def060bd7d0bcb10bfe7f0 SHA-1: 2a93cc7d3593f77165266c316f426b3d719371b9 SHA-256: 924239b3fbc08ead4c9c129a56157963fe548e9839b462239a7158ce3b5eedc1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains numerous external URIs, with one pointing to 'jacksth.ru', suggesting a redirection to a malicious site for phishing or malware delivery. The PDF's structure and embedded links indicate it's part of a link farm, a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/strik?utm_term=combahee+river+collective+statement+author PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369491/normal_5fda52f08b4d4.pdfIn PDF document text
    • http://eslivdrug.space/how_to_calculate_p_value_for_two_tailed_z_testoloeb.pdfIn PDF document text
    • https://vugesajovor.weebly.com/uploads/1/3/4/2/134265649/tolip-fudez-movabefakisazeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467581/normal_601aba66d48b1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393197/normal_5ff37c51516a4.pdfIn PDF document text
    • http://dimifepovez.22web.org/canon_lide_300_scanner.pdfIn PDF document text
    • https://jipunone.weebly.com/uploads/1/3/5/3/135349916/lirugenivivux-seruwofiset-tutonuligo.pdfIn PDF document text
    • http://granitmetrospecstroy.ru/texto_argumentativo_expositivozlf64.pdfIn PDF document text
    • https://kabaposirivapej.weebly.com/uploads/1/3/2/6/132680813/3044142.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4529095/normal_5fe451fd7aae3.pdfIn PDF document text
    • https://pibowalemarume.weebly.com/uploads/1/3/1/1/131164440/a5f668fe.pdfIn PDF document text
    • http://ryursew.space/cae_speaking_practice_testsbr2wk.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
    • https://s3.amazonaws.com/rokuwapesu/super_simple_songs_baby_shark.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/movon.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/tavijore.pdfIn PDF document text
    • http://xefivaz.epizy.com/yearnings_of_the_wind_piano_sheet_music.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_off000121a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A9 5144 bytes
SHA-256: b9a105cca9b4631b7415ace99c9f122c6babb4ab29ff2f91c482044b15191bd2
font_01_sfnt_off00013308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13308 11476 bytes
SHA-256: d83de00167bd05fdf74b69bf378ae3b195f5706738cb2be5a1d797ebc88d45d9
font_02_sfnt_off00015966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15966 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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