Malicious PDF — malware analysis report

Static analysis result for SHA-256 c287710546d65a26…

MALICIOUS

PDF

73.7 KB Created: 2020-12-23 04:10:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de90561e8cd9cc0977f789eecc3d7567 SHA-1: da08c8729ece7a38af568c4ca9f148eaba870f1d SHA-256: c287710546d65a26b7213d590bb85c78594e96518c2db0acc0d4388136be2b7b
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, with the primary malicious URL being trafftec.ru. ClamAV and an ML classifier also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and link farm indicate an attempt to redirect users to potentially malicious websites.

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://trafftec.ru/strik?utm_term=origami+heart+dollar+bill+with+quarter
    • https://cdn-cms.f-static.net/uploads/4478926/normal_5fd2cb52901e3.pdf
    • https://boxesagako.weebly.com/uploads/1/3/4/5/134589877/tedutegowisazi.pdf
    • https://welerenumabo.weebly.com/uploads/1/3/4/4/134467224/lefinijurakoje.pdf
    • https://static.s123-cdn-static.com/uploads/4474734/normal_5fcf4205c5ebc.pdf
    • https://cdn-cms.f-static.net/uploads/4369141/normal_5fa1e4dd2ca76.pdf
    • https://cdn-cms.f-static.net/uploads/4417519/normal_5fbf5c60ea019.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/bac4128f-3ad0-4029-a0ac-7ed4ed1b9ca8/38436744322.pdf
    • https://static1.squarespace.com/static/5fdd3a932dcd53187f1eaf8b/t/5fdd7ae02629b066aba16037/1608350435745/borland_c_builder_6_full.pdf
    • https://uploads.strikinglycdn.com/files/35e62ba8-cf35-4816-b361-5a00e6d25f37/kogimunomarope.pdf
    • https://uploads.strikinglycdn.com/files/3109e06c-0c26-4076-8b28-ea1b02c2a182/siwazoxopub.pdf
    • https://uploads.strikinglycdn.com/files/c624a47f-f067-4c8e-a302-e050662e0966/bakizu.pdf
    • https://static1.squarespace.com/static/5fce1d1d0db0542b884decda/t/5fcee0d268c18617d402d468/1607393491466/kodibimo.pdf
    • https://uploads.strikinglycdn.com/files/99c5f1b8-dad0-469b-a24a-978df17df4cf/43897536060.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5eb.bin
182bfabf417107ecaac01ec9addda27818bf8c3568007b0a963056585fcc4262		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EB 5224 bytes
font_01_sfnt_off0000e7b8.bin
0a095ca04ecec214de8c7a9c31f616adc590c6e7f138daedc9dfb7672a7b03fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B8 10692 bytes
font_02_sfnt_off00010c3e.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3E 4324 bytes

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