Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8d3c3d97476e8ff…

MALICIOUS

PDF

68.1 KB Created: 2020-11-21 02:13:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 900e544acdd582335248f0b0ea107273 SHA-1: 276015886d5972414c8a3f444c850f49ef382480 SHA-256: b8d3c3d97476e8ff61cbb849be7fbe88100b03e80facd1f3cd24b074524a1b2f
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, many pointing to other PDFs, suggesting a link farm or redirection mechanism. The primary malicious URL identified is 'https://trafffe.ru/123?utm_term=isagenix+30+day+system+guide+pdf', which likely serves as a lure for phishing or malware distribution. No scripts were extracted, but the presence of numerous external links and the 'PDF_SEO_LINK_FARM' heuristic strongly suggest the document's purpose is to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=isagenix+30+day+system+guide+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385633/normal_5f98ad9f416af.pdfIn PDF document text
    • https://bilewazivabo.weebly.com/uploads/1/3/2/8/132816117/mozasekukigobeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422658/normal_5fb6e760386f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471109/normal_5fafafa641629.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454967/normal_5faade71a42ab.pdfIn PDF document text
    • https://jibudodenip.weebly.com/uploads/1/3/4/3/134364722/808d31300.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499283/normal_5fb36cd585667.pdfIn PDF document text
    • https://lewonodi.weebly.com/uploads/1/3/4/3/134330754/fiximonow-wezager.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/6314fa39-3793-437b-9e52-fbd5b8b5e30a/52676081663.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04b82281-1978-4e79-8332-d8c730631df1/48261832101.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/45416555254.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efde1d15-9ff3-4861-b450-c910905abe48/55356910613.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_off0000cd4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4F 5644 bytes
SHA-256: 94ec474acf113486c9bd7638848153139b70d7bffdcd120850f639e15e52d06a
font_01_sfnt_off0000e090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE090 10420 bytes
SHA-256: 86d60d05b1c67f7895367ffb477404ac27acf7b537516f5bd22efafa4ce0983f

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