Malicious PDF — malware analysis report

Static analysis result for SHA-256 3278209e6f49c494…

MALICIOUS

PDF

71.9 KB Created: 2021-02-25 02:33:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: b4e9439a055fc42922621a78a6ac102e SHA-1: 7d325a607814ad22e55801ee295bc85f346b1447 SHA-256: 3278209e6f49c49430ccba53e62d05602fc8aed2276790a2803a5952b4b4f88e
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://crophysi.ru/strik?utm_term=c+programming+interview+questions+pdf+download', disguised as a C programming interview questions PDF download. The ML classifier also flagged this PDF with a high probability of being malicious. While no scripts were extracted, the presence of malicious URLs and the lure text strongly suggest a phishing attempt to redirect users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://crophysi.ru/strik?utm_term=c+programming+interview+questions+pdf+download In PDF document text
    • http://pixunune.sportsontheweb.net/74021148775.pdfIn PDF document text
    • http://meetplafond.xyz/520019279577lcm5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463532/normal_5ff1ff45d6d27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485176/normal_601f315cc0753.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465941/normal_5fe3c035ebb67.pdfIn PDF document text
    • https://bawidonawasaz.weebly.com/uploads/1/3/4/3/134354070/1038498.pdfIn PDF document text
    • https://pamigewome.weebly.com/uploads/1/3/4/6/134631685/zovita.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453338/normal_60283c025d9f4.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/jenisozazewubo/complaints_management_policy_template.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/tenufa.pdfIn PDF document text
    • https://s3.amazonaws.com/pulavokaxe/devefizapulowanesatobuz.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_off0000dc5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5B 5544 bytes
SHA-256: 2a07b1fec6382d62ceae71d8e752024b9a4a832d1710b2f792ce820523a89b5e
font_01_sfnt_off0000ef2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2B 10384 bytes
SHA-256: ea0d2026bb82a32f4f0b97c854fdd66fa73531f7ca76c825705f1637224f9163

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