Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0bc1e552f68efee…

MALICIOUS

PDF

72.5 KB Created: 2021-02-26 22:00:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: ad4a866b8f056e00636c9152f4cca332 SHA-1: 98c0bc4c713a3d2a3633cebb7d5c86f336671aa2 SHA-256: d0bc1e552f68efee4d042c0d8e2876f80b9c4e592eb4f979e395b9e0def4ad2a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are generated in a pattern suggestive of a link farm or SEO spam. The ML classifier and ClamAV detection strongly indicate maliciousness, with the PDF being identified as a phishing trojan. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious sites, likely for further exploitation or credential harvesting.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://botokaw.ru/strik?utm_term=whirlpool+gold+steam+clean+oven+manual PDF link annotation
    • https://vavivaso.weebly.com/uploads/1/3/0/8/130873957/varaf_jawilom.pdfIn PDF document text
    • https://sovanomi.weebly.com/uploads/1/3/5/3/135337195/xizadavotazi_zimovabubu.pdfIn PDF document text
    • https://naruvemekojesez.weebly.com/uploads/1/3/4/6/134685524/bujitubabe_vikususo_jebaxobuna_vajisa.pdfIn PDF document text
    • https://fopojikanerev.weebly.com/uploads/1/3/4/8/134888820/tudafevi_renanafi_rilunifujeko_wuwijekaxigex.pdfIn PDF document text
    • http://kuxufijum.iblogger.org/22143699340.pdfIn PDF document text
    • http://nitesufi.sportsontheweb.net/pizuwememikew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jorowoti.epizy.com/81541495857.pdfIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/email_newsletter_templates_ms_word.pdfIn PDF document text
    • http://zubeleboju.epizy.com/harbinger_down_full_movie_free.pdfIn PDF document text
    • http://fakadigat.epizy.com/46704876320.pdfIn PDF document text
    • http://jifadeve.rf.gd/97810623132.pdfIn PDF document text
    • http://sutexuvidag.myartsonline.com/masatafejazazijuxumo.pdfIn PDF document text
    • http://runesufosufej.rf.gd/bollywood_songs_mp4_free.pdfIn PDF document text
    • https://s3.amazonaws.com/domegagowevag/3003692556.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/binder_paper.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/jezogele.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/ethical_issues_in_psychology.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_off0000df26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF26 5560 bytes
SHA-256: d34f6e0f618f70853e534ab8492e7db6340842d03d2d20cb1faa17462a0ef87e
font_01_sfnt_off0000f1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F8 10192 bytes
SHA-256: a1679f8d71106c75c8e2a1d553cd09fe5528ae66789204e2e24297e21d7b7bec

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