Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6257884f5e959d0…

MALICIOUS

PDF

68.1 KB Created: 2020-11-12 21:50:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 04f593851894b63ab14132cc66029262 SHA-1: 7656d42943146ef5cb288085eb7601ca366447d1 SHA-256: d6257884f5e959d0ee71c2536ecb34f84a94cca1ef73b6491b5e5c5a4cef187c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. While no scripts were explicitly extracted, the presence of numerous external links suggests an attempt to lead the user to potentially harmful content.

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://traffine.ru/123?utm_term=embers+of+war+wiki
    • https://cdn-cms.f-static.net/uploads/4413851/normal_5f9f74468a148.pdf
    • https://cdn-cms.f-static.net/uploads/4384640/normal_5f9c8817890a1.pdf
    • https://cdn-cms.f-static.net/uploads/4418368/normal_5f982af48d85b.pdf
    • https://mojenosude.weebly.com/uploads/1/3/1/3/131382274/bisavilokutedalov.pdf
    • https://cdn-cms.f-static.net/uploads/4406455/normal_5fa306e791a9b.pdf
    • https://sonadenazutimiw.weebly.com/uploads/1/3/4/6/134654654/totaxe_xewijam_xanedon.pdf
    • https://cdn-cms.f-static.net/uploads/4370073/normal_5f898a3283cd6.pdf
    • https://diminulagiv.weebly.com/uploads/1/3/4/4/134489960/833012.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/henghuili-files2/human_body_worksheets_for_2nd_grade.pdf
    • https://s3.amazonaws.com/lorifumofelu/dishonesty_quotes_in_relationships.pdf
    • https://uploads.strikinglycdn.com/files/35756cc9-5511-4421-8dd9-dfefb16ee17b/yeh_hai_mohabbatein_5th_december_2019.pdf
    • https://uploads.strikinglycdn.com/files/e28977c9-d261-485d-950d-5fe7300d0baf/60270613907.pdf
    • https://s3.amazonaws.com/xovajukoxin/rixolixos.pdf
    • https://s3.amazonaws.com/vogubivajavofu/dujodugodanas.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_off0000cbdc.bin
13ec7f8a1f32961d589d9a2f7a276d81db203a6ce71ba948cecca76519f849a6
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDC 5136 bytes
font_01_sfnt_off0000dd52.bin
88b8881cde64988a9ff555e220096075167998d0ebfdb206e32fbf524de5b11b
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD52 12484 bytes