Malicious PDF — malware analysis report

Static analysis result for SHA-256 03e4895540cb356a…

MALICIOUS

PDF

66.4 KB Created: 2020-11-26 00:33:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4d83fe268f908d7f188f80622692e22d SHA-1: 9227c8fc0ea331ae1936138a8914c5bbd74ca791 SHA-256: 03e4895540cb356a6a98afbc6e9ebd4665eae2302e50d2b51e1a7dd5c8b1541d
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. Although the document body is heavily obfuscated, the presence of a malicious URL is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gettraff.ru/strik?utm_term=zucchini+bread+paula+deen
    • https://cdn-cms.f-static.net/uploads/4426080/normal_5fa0ae6fecd95.pdf
    • https://cdn-cms.f-static.net/uploads/4491965/normal_5fbca324ce1c7.pdf
    • https://cdn-cms.f-static.net/uploads/4376359/normal_5fa27399eefc5.pdf
    • https://cdn-cms.f-static.net/uploads/4426408/normal_5fa5c0a9648a9.pdf
    • https://cdn-cms.f-static.net/uploads/4453741/normal_5fa5b4bc64008.pdf
    • https://cdn-cms.f-static.net/uploads/4448103/normal_5f9efb9fc39d6.pdf
    • https://cdn-cms.f-static.net/uploads/4379970/normal_5fb45f63b8f40.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tudawufed/7482950559.pdf
    • https://s3.amazonaws.com/xumakomowi/vezuzuwi.pdf
    • https://s3.amazonaws.com/lupebesu/fegexotikitaxoteru.pdf
    • https://s3.amazonaws.com/batoragubukepo/biochemical_test_in_microbiology.pdf
    • https://s3.amazonaws.com/pubopelej/natovenikexinoji.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6c8.bin
3c38c67068555773eafa01976e1118954a0809f084c359ba1c437bdf5b159d04		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C8 5080 bytes
font_01_sfnt_off0000d804.bin
1c53165519d8f1cdb4aa86fbe663010114bfe9fdab1293b06f112810f0e99812		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD804 11172 bytes

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