Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaf9c9839de5ce81…

MALICIOUS

PDF

68.1 KB Created: 2020-11-12 22:01:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: d4ae9e8ae857f3781080094b596fc50b SHA-1: c044865aa048e136c353d948245c9c98d6b02c13 SHA-256: aaf9c9839de5ce81dafa7726821abe65eb5c26c08dda104d13a86a13cfe1ab56
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, pointing to various PDF files. One of these links, 'https://trafficel.ru/123?utm_term=cool+currency+serial+numbers', is directly embedded and suggests a lure related to currency. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests an attempt to drive traffic to malicious or deceptive content.

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://trafficel.ru/123?utm_term=cool+currency+serial+numbers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4443819/normal_5f9de816db685.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366659/normal_5f8c61c00fc8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374360/normal_5f8e16d69e759.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461505/normal_5fa3bb98001ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367019/normal_5f87c45a372dc.pdfIn PDF document text
    • https://totapige.weebly.com/uploads/1/3/1/4/131483287/lutol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369318/normal_5f9b01c855c62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450151/normal_5faa6ed9679b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414353/normal_5f9659a2ec45a.pdfIn PDF document text
    • https://titumakusijuvap.weebly.com/uploads/1/3/4/3/134353199/778622.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/85253755237.pdfIn PDF document text
    • https://s3.amazonaws.com/dojonuta/tv_zion_apk_download_for_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15dadd8d-8e1e-4bfe-9e32-d6c7baf32d65/bosch_dishwasher_manual_check_water.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC416 5092 bytes
SHA-256: 756bfd31bdfbd75131a15454819bd0277b126622febc4afb13276b7d40bb0a1d
font_01_sfnt_off0000d54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54C 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off0000ddda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDA 11052 bytes
SHA-256: 567d3b1b3737762ad7b130239bde0ffe74529b7f5879c54822eb349d35cb4c0c

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