Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0bafeb9d0c405dc…

MALICIOUS

PDF

77.1 KB Created: 2021-04-09 15:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: c38546ee587f20834b59a28772e24b13 SHA-1: 67535ff1235329c50424376da2cea094a6bdcf7d SHA-256: b0bafeb9d0c405dc76b9b6a2bfe4b77bd1db831b40e596b20cecb8c96c4bb688
146 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting an attempt to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate effort to create a link farm on disposable hosting, further supporting the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://ponafet.ru/strik?utm_term=pedagogy+of+the+oppressed+pdf+chapter+3 PDF link annotation
    • http://lerinumemikiw.22web.org/josuguxomopoz.pdfIn PDF document text
    • http://serururepus.scienceontheweb.net/85426016251.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492253/normal_604ce5c2ba702.pdfIn PDF document text
    • https://wabobileminila.weebly.com/uploads/1/3/5/4/135400898/1356009.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472208/normal_5fd3a2534f57e.pdfIn PDF document text
    • https://zujituxo.weebly.com/uploads/1/3/2/6/132681889/7103819.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368506/normal_5ff3e0a441c8f.pdfIn PDF document text
    • http://ludesajezopaju.medianewsonline.com/50821735307.pdfIn PDF document text
    • http://gagapazu.scienceontheweb.net/rizetetimu.pdfIn PDF document text
    • http://beviluxenumiliv.mywebcommunity.org/bijomudewabawaxo.pdfIn PDF document text
    • http://pirewarekow.mywebcommunity.org/49426995486.pdfIn PDF document text
    • https://vepenisa.weebly.com/uploads/1/3/4/3/134339982/suwureb.pdfIn PDF document text
    • http://jetodubiropev.iblogger.org/anganwadi_form_in_delhi_2018.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rukawinasi.rf.gd/causative_exercises_advanced.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/macromolecules_review_worksheet_for_biology_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/dixaxamorigifeweferufipa.pdfIn PDF document text
    • http://bajupigirosinaf.atwebpages.com/how_to_reset_lg_top_loader_washing_machine.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_off0000ee7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7D 5652 bytes
SHA-256: 53dc0f1d80b9be3fa0644816291f893a9bda0a129f6682f815193bbd4948c2ae
font_01_sfnt_off000101c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C8 11444 bytes
SHA-256: e6e75294288552ddb626539af46b42bc4cb4f8df95732a20ae5b2a1d1589f29a

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