Malicious PDF — malware analysis report

Static analysis result for SHA-256 5433ff5aea2ad6e5…

MALICIOUS

PDF

71.5 KB Created: 2020-11-20 14:25:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98343d7dc23d09aee2a29ef9d50ff436 SHA-1: 58276e1b3ab7b01b9c81263bd19608db9943d8e0 SHA-256: 5433ff5aea2ad6e54049d5da7a4275ff8c996ef6841dccf26176fa9a74991b63
156 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm or SEO manipulation, embedding a large number of external links, one of which is a suspicious URL. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is used to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffnew.ru/strik?utm_term=autoconcepto+definicion+rae
    • https://wefejakero.weebly.com/uploads/1/3/0/8/130814310/e6064b5a.pdf
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/9031774.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c2e77f80-2092-41eb-a24f-6ef8f2a3f3e0/52047940086.pdf
    • https://uploads.strikinglycdn.com/files/962b12e3-adc0-420f-a3d9-0ac38ef2b423/nuferamogemurenalomudaj.pdf
    • https://uploads.strikinglycdn.com/files/2d3feabe-b607-40e7-aa5b-bf38de0fd4f7/foziruxagisijokatabisotu.pdf
    • https://uploads.strikinglycdn.com/files/11ffae70-9f42-4d8e-9b58-a00354878ff0/2026381883.pdf
    • https://uploads.strikinglycdn.com/files/fc5598f7-83e3-4784-ab2a-11f5aa4e7685/14849556984.pdf
    • https://uploads.strikinglycdn.com/files/a79a686c-b9e8-4f89-8ca9-27fdb30e9cb1/klein_multimeter_symbols.pdf
    • https://s3.amazonaws.com/rujabepifar/ebook_reader_fr_eigene_dateien.pdf
    • https://s3.amazonaws.com/sigobija/77030115556.pdf
    • https://s3.amazonaws.com/takebemanijewok/kugexutufofifamarifuf.pdf
    • https://uploads.strikinglycdn.com/files/a2ebf841-164a-4fee-a87f-b84f73cf0d8b/heather_florida_teen_models.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd3b.bin
0aa78c86dec21c69ac6f803fadf8f7fe3f091103c7456113ae91347739427d84
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3B 4928 bytes
font_01_sfnt_off0000ee17.bin
07c77fd15b9e77fac2a4e6086677be27171a128f49c82ef647b206175668721e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE17 10460 bytes