Malicious PDF — malware analysis report

Static analysis result for SHA-256 24b46cdf366b8b2d…

MALICIOUS

PDF

78.8 KB Created: 2021-03-07 15:19:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 47d4e45d07609612aa4df8db11acbcf2 SHA-1: 62bf8634d1426394e7283a1e713227c98534a2b6 SHA-256: 24b46cdf366b8b2d7f99cec05b201e4c98415e46c9867277aeaca1d00dabb98b
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, and is identified as a link farm. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it might be a generated document used to disguise malicious links. The presence of external URIs and the link farm heuristic strongly indicate an attempt to redirect users to malicious sites.

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://druttle.ru/wb?keyword=winning%20the%20loser PDF link annotation
    • http://datinge.site/why_wont_my_onn_headphones_connectdrg26.pdfIn PDF document text
    • https://lukozosa.weebly.com/uploads/1/3/4/4/134485969/soramulot.pdfIn PDF document text
    • https://cdn.sqhk.co/pixafosabow/8KHDBG9/mumuxepupevu.pdfIn PDF document text
    • https://desijikero.weebly.com/uploads/1/3/5/9/135964668/likazapererum-kixapasolepabup-firotanedava.pdfIn PDF document text
    • https://fafamamijusoma.weebly.com/uploads/1/3/4/3/134371196/cf9275212675f2.pdfIn PDF document text
    • http://italysummer.space/what_are_the_most_debated_topicsi0g3s.pdfIn PDF document text
    • http://rubewox.sportsontheweb.net/52141933105.pdfIn PDF document text
    • https://cdn.sqhk.co/xaxovowupofa/mUUjhea/nidifiw.pdfIn PDF document text
    • http://storezone.info/jibiwinozomavitaruxenoo83xg.pdfIn PDF document text
    • http://zoo-taxi.site/dyson_ball_animal_pro_upright_vacuum_maintenances9p0q.pdfIn PDF document text
    • https://tatidadimu.weebly.com/uploads/1/3/5/3/135383915/rozigu_fakaripoz_doletesog.pdfIn PDF document text
    • https://cdn.sqhk.co/zaperarori/cijprhg/call_of_duty_companion_app_squads_not_working.pdfIn PDF document text
    • http://tebeririz.scienceontheweb.net/retaleruza.pdfIn PDF document text
    • http://wbigs.space/pocket_warfare_kingdoms_apkgwys2.pdfIn PDF document text
    • http://xuvaxujogilo.mygamesonline.org/pababa.pdfIn PDF document text
    • https://cdn.sqhk.co/moviferu/XDJhehb/26814810716.pdfIn PDF document text
    • https://xorizelipuv.weebly.com/uploads/1/3/1/6/131637744/8625937.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/rirusozo/1468720032.pdfIn PDF document text
    • http://lusajafimaneru.myartsonline.com/unit_6_geometric_proof_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/34893648436.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_off0000f694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF694 5284 bytes
SHA-256: 21d585d568e594a21f82e875f252ba39e171c9c1985c667a56c2e67ee0cb64a1
font_01_sfnt_off00010875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10875 11028 bytes
SHA-256: 28273e8ad27f4fb25aa675d0c8509a77e172bd3604f605a287a7072b8fccbf72

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