Malicious PDF — malware analysis report

Static analysis result for SHA-256 d80d1c8809d3ccef…

MALICIOUS

PDF

77.6 KB Created: 2020-12-18 09:43:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1614b3cd1128213344381e1e3a4e970c SHA-1: 18bec0d4eee40c1db28810f569407cb3022b1ec4 SHA-256: d80d1c8809d3ccef5376b6bf925dcfed938031408d62164886a05a1a371a2183
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 heuristic firings reveal it contains a large number of external links, suggesting it functions as a link farm for SEO purposes. One of the primary URLs identified is 'https://trafffe.ru/strik?utm_term=sm-j337v+sd+card', which likely serves as a distribution point for further malicious content or phishing attempts. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing content, but the link farm heuristic strongly implies a malicious purpose.

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://trafffe.ru/strik?utm_term=sm-j337v+sd+card
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/foburadip.pdf
    • https://sizuginoten.weebly.com/uploads/1/3/4/4/134490660/6484864.pdf
    • https://vamalogobiw.weebly.com/uploads/1/3/4/6/134696595/51f1715e56cce7.pdf
    • https://gokasesebigi.weebly.com/uploads/1/3/3/9/133986942/misibenur_busonifulaga.pdf
    • https://jawuvufos.weebly.com/uploads/1/3/4/8/134856807/keradedekisagajaxudi.pdf
    • https://cdn-cms.f-static.net/uploads/4369519/normal_5f970b1915a23.pdf
    • https://xobijetulotifo.weebly.com/uploads/1/3/4/2/134234675/6234845.pdf
    • https://wumetitazidizo.weebly.com/uploads/1/3/4/8/134885052/kaxizesoj.pdf
    • https://garisufusomepis.weebly.com/uploads/1/3/0/7/130740000/xokasikon-delut-xawebekefo.pdf
    • https://cdn-cms.f-static.net/uploads/4530070/normal_5fd7b7b05029b.pdf
    • https://cdn-cms.f-static.net/uploads/4406191/normal_5f994cf0bcd9c.pdf
    • https://vozekokojexofu.weebly.com/uploads/1/3/4/6/134645554/rubor.pdf
    • https://cdn-cms.f-static.net/uploads/4402745/normal_5fa1dce52b589.pdf
    • https://cdn-cms.f-static.net/uploads/4416149/normal_5f9553e0a962f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc0d53ff7cf8c75402a95c2/t/5fc5691deaf37e3b6452f562/1606773022022/disney_jewellery_by_couture_kingdom.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000ffb1.bin
653608e7f7fef1be61dc5b2b086bd6946207bba5ed0dff931254e9ef0ae3e4d6		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFFB1 23120 bytes
font_00_sfnt_off0000c71f.bin
b103a7960a4ec9472e3f3e2660cdf4d3135d405812693bf823d15d9458719e6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC71F 5568 bytes
font_01_sfnt_off0000da17.bin
e350d5796d062a6a44273894989342a0feb3801b0b7d424fa1056f1221dde209		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA17 10932 bytes

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