Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cf3561c01dce129…

MALICIOUS

PDF

65.3 KB Created: 2020-11-14 07:41:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 663eecdcda8f41bb896601324d6ebcc0 SHA-1: 1170b245982a129dd287dbd642ad43131ecf4c33 SHA-256: 9cf3561c01dce129978760fdfa74afdd3147ea2654947ef5d42c46b048fc6011
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to redirect users to potentially harmful websites. The ML classifier and ClamAV detection strongly indicate malicious content. While no scripts were explicitly extracted, the presence of numerous external URLs points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/123?utm_term=town+hall+8+war+base+copy+link
    • https://boguvetasitob.weebly.com/uploads/1/3/1/3/131380850/pomegufeju.pdf
    • https://cdn-cms.f-static.net/uploads/4405929/normal_5f9216ec7af16.pdf
    • https://cdn-cms.f-static.net/uploads/4382631/normal_5f8ed35896236.pdf
    • https://bizowubojixix.weebly.com/uploads/1/3/4/2/134265373/fafadigexuwerub.pdf
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/3e75a4e696b2f2d.pdf
    • https://rowidonisobixi.weebly.com/uploads/1/3/4/3/134374630/0a262e31.pdf
    • https://pinosapop.weebly.com/uploads/1/3/4/1/134131344/4079759.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/075c8810-f89e-4940-a322-f01001351a06/judedenozurijukaxori.pdf
    • https://s3.amazonaws.com/fasanag/tajogomogu.pdf
    • https://s3.amazonaws.com/vovopafubipu/stomp_pit_bikes_for_sale.pdf
    • https://s3.amazonaws.com/mufukep/free_carport_plans.pdf
    • https://s3.amazonaws.com/jobavo/tosolasu.pdf
    • https://s3.amazonaws.com/jeworurowam/joshua_david_hitson.pdf
    • https://s3.amazonaws.com/gupuso/votuxezi.pdf
    • https://s3.amazonaws.com/dinisemowoge/wasipebuluwewomotazapej.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_off0000c314.bin
37fbde9da55ad40de46dc4e4d9002bf68906391773f882682de1e4326f23e0aa
pdf-font-stream PDF embedded font (sfnt) at offset 0xC314 5564 bytes
font_01_sfnt_off0000d60b.bin
ced60bb3ea427796fa8dda61f99ea8d010bf5803f87f9a4cc00b28331debec6b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD60B 9976 bytes