Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3c414e8ef5aa137…

MALICIOUS

PDF

74.5 KB Created: 2020-11-25 15:14:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d33eb41fa941ae25fed061b156199a2 SHA-1: 7590a03f297f291394abe40fe6280cb748559de3 SHA-256: d3c414e8ef5aa13756b3473c18a205392f633d94f897b9d6573757e51ffa42d2
184 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a link farm, indicating a large number of external links embedded within the document. One of these links, 'https://traffnew.ru/123?utm_term=how+to+become+a+notary+in+mobile+alabama', is suspicious and likely part of a phishing or redirection scheme. The presence of a 'callback phishing phone lure' heuristic further supports a social engineering attack. ClamAV also detected this file as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=how+to+become+a+notary+in+mobile+alabama
    • https://cdn-cms.f-static.net/uploads/4389821/normal_5fac479c1aa93.pdf
    • https://cdn-cms.f-static.net/uploads/4416656/normal_5f9b9ef1799a8.pdf
    • https://pepisukuwen.weebly.com/uploads/1/3/1/6/131606293/vadazipu.pdf
    • https://cdn-cms.f-static.net/uploads/4406456/normal_5faa28346b2d8.pdf
    • https://cdn-cms.f-static.net/uploads/4403143/normal_5f971916172d4.pdf
    • https://gamunodeda.weebly.com/uploads/1/3/4/7/134765824/5208445.pdf
    • https://sukuvigu.weebly.com/uploads/1/3/4/2/134236057/3baaad13fe135.pdf
    • https://cdn-cms.f-static.net/uploads/4380411/normal_5f8e03f4a61b6.pdf
    • https://juvikenozenukun.weebly.com/uploads/1/3/4/3/134322787/tunifo-xilin-fowenuzoxiga-mulowoj.pdf
    • https://retujofidevi.weebly.com/uploads/1/3/4/6/134621577/kujajexizesiviz.pdf
    • https://xuvetopugoseja.weebly.com/uploads/1/3/4/4/134484667/wedigebaxoripo.pdf
    • https://cdn-cms.f-static.net/uploads/4450641/normal_5f9e960928305.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/195ac796-2ea6-4e19-97e9-91350691e6ca/materi_usbn_biologi_sma.pdf
    • https://uploads.strikinglycdn.com/files/841aebf0-a269-4bf8-a3c9-8ecefcb08ecf/world_of_warcraft_the_official_cookb.pdf
    • https://uploads.strikinglycdn.com/files/f7a31853-b855-4d2b-81f9-eed10b3ac5ca/gajetapezotizagegosuwov.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_off0000e6cd.bin
b4c31fd12e8c1024ad07366e752a92916bd36034b8e6ce73cca0026d09edf04c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CD 5064 bytes
font_01_sfnt_off0000f801.bin
3a239c8cbfa4cf0b01f88b6ef6474182c0e781c62df30fc6f67afcf55a89dc1b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF801 10800 bytes