Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc4d1a35aaef08a6…

MALICIOUS

PDF

75.1 KB Created: 2021-01-06 12:59:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 88a0c5b4caf4bd2ef738d4a79056ef71 SHA-1: 9bddc2b53be22139e09442f718e1e7dcf92edacc SHA-256: cc4d1a35aaef08a64b93a9bbf45c2a8688113455d8aae621d2414da27889b4f1
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to PDF files hosted on file-sharing services, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/aws?utm_term=amway+atmosphere+air+purifier+manual PDF link annotation
    • https://lurukise.weebly.com/uploads/1/3/4/4/134454795/baxejuzukifuv_xepozifa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369173/normal_5f9e2fc7030f0.pdfIn PDF document text
    • https://wekigenajelu.weebly.com/uploads/1/3/3/9/133999196/wokivu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455901/normal_5ff00746c8cbc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424985/normal_5fe05c66bdf99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476142/normal_5fa7eb3d9d1ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416490/normal_5fb83b40614f0.pdfIn PDF document text
    • https://gibiboxovozigux.weebly.com/uploads/1/3/4/7/134722082/98e205735.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383444/normal_5ff51dbd79f87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383574/normal_5f9b47c0b73f2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90C 5324 bytes
SHA-256: de56cae232f389761ce3417fc20f705f0e0f8be1e3d9fb096697c0b30073dc55
font_01_sfnt_off0000fb13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB13 10776 bytes
SHA-256: d0c81149b461157377472cb06eaba87e08df312bb19ce4fc97c565f241160d9f