Malicious PDF — malware analysis report

Static analysis result for SHA-256 35d686d8881ff538…

MALICIOUS

PDF

71.1 KB Created: 2020-11-14 04:00:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 74b4bb940e59eb1d72b2428eef2a8b12 SHA-1: b0d8ef7ae6b2b7f65c43b85660b5fe97ebbe6ee2 SHA-256: 35d686d8881ff5383394143a6e767a9e8bea58f646951b7d111f68fca6f36689
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used to redirect users to malicious sites for phishing or malware downloads. The heuristic PDF_SEO_LINK_FARM specifically indicates a link farm, suggesting an attempt to manipulate search results or distribute content across many domains. While no scripts were directly extracted, the presence of external links and the ML classifier's high confidence score point towards malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffe.ru/aws?utm_term=imperial+city+prison+veteran+guide PDF link annotation
    • https://xalipifizipig.weebly.com/uploads/1/3/1/3/131379045/4f044a54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369494/normal_5f89ba67e7293.pdfIn PDF document text
    • https://lilawowawumoxo.weebly.com/uploads/1/3/1/4/131453384/5bb654.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369653/normal_5f8f318487028.pdfIn PDF document text
    • https://voziguwotameba.weebly.com/uploads/1/3/4/3/134345279/visokumevu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386597/normal_5f9088f6b9e9d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f94ed265-2e1e-487a-b1ca-b3afa71a4349/63023780123.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea18b872-3d63-400a-b541-61578a3d77d0/xiwonedorubuxix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2850db8-ada1-4452-8a72-e1be403c0c61/whitley_streiber_communion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1be7accc-9d8b-47fd-91e3-f088e25d3bbc/fonolelago.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bc29d08-791f-4714-a668-a9ab9eeff65d/43049771968.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20d7f050-4367-4951-9f39-fe066655c398/12031178721.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89f88ff1-12f1-4bca-89f6-fb1a0df88bb1/james_m_brown_elementary_sc.pdfIn 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_off0000d873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD873 5492 bytes
SHA-256: 2334630dcb37fc4118c2a5079ad2532fcb1ca6a4801bc330cc92cd6993162b13
font_01_sfnt_off0000eb14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB14 10580 bytes
SHA-256: eebeaaeb4040919fe99228807c8d6bfae2936155117749b76f9b1431b9d15cc4

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