Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa677a184d1c36e6…

MALICIOUS

PDF

76.1 KB Created: 2021-01-17 23:48:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 1f02cf5284fd611ed031d14794094cf7 SHA-1: 74a3da3dd7b4179a4b91557ae56359fe5a8ecdd5 SHA-256: aa677a184d1c36e6738a35ea42b4a9d9138577de1c99b39d2b27c381bf7e4ff1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malicious redirection scheme, likely initiated via spearphishing.

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://trafffe.ru/123?utm_term=persona+4+rescue+requests PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471509/normal_5faedef613291.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409813/normal_5fbbe6671e99e.pdfIn PDF document text
    • https://vojidejera.weebly.com/uploads/1/3/2/6/132695434/8994449.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379049/normal_5f9d4f5fb075d.pdfIn PDF document text
    • https://lafuworopiraw.weebly.com/uploads/1/3/4/3/134341657/finewi-zotonukuletum-powidabaweb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402960/normal_5ff9f8ea210d2.pdfIn PDF document text
    • https://jedopebo.weebly.com/uploads/1/3/4/8/134889916/fizij.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/zizene/leipzig_tourist_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/dukavunivifa/redundancy_guidelines_acas.pdfIn PDF document text
    • https://s3.amazonaws.com/pujinit/in_him_alone_piano.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/sezazavaximuri.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/bhu_b._sc_agriculture_form_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/jewugovosudanulamas.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/limonevapotorewikuta.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/72697808650.pdfIn PDF document text
    • https://s3.amazonaws.com/desenaz/titir.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/bangla_album_video_song_full_hd.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_off0000ecd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD4 4976 bytes
SHA-256: f4542d68502aac2674f1ae858d77c3f1983425732180ef9ff59481d938982b68
font_01_sfnt_off0000fdd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD9 10964 bytes
SHA-256: 328d567cc7f19abe20126158f23e48dc1422f0b1d1a6b4874df273c793c3e48d

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