Malicious PDF — malware analysis report

Static analysis result for SHA-256 daf96ef71e2b7546…

MALICIOUS

PDF

70.9 KB Created: 2021-02-16 21:18:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 42f09b73dacb6f644f26dd64245d5c9d SHA-1: dc18aa2b0edc2ea62ea19acc72c4e0b577e85ece SHA-256: daf96ef71e2b754645d8815201ae213905dc03da2d9e85fb84a5b3d92cc211d6
154 Risk Score
Tags
free-cdn-ebook-manual-lure

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://yafferge.ru/strik'. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the embedded URL is the primary indicator of a phishing or malware delivery attempt, likely disguised as a document about workplace safety.

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://yafferge.ru/strik?utm_term=what+is+the+most+common+risk+to+health+and+safety+in+the+workplace In PDF document text
    • https://cdn-cms.f-static.net/uploads/4476427/normal_60280c92494d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414514/normal_5fe640424253f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407777/normal_5fdb59bf79151.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467979/normal_5fefbb702ad6c.pdfIn PDF document text
    • https://vidiguwases.weebly.com/uploads/1/3/4/3/134347373/e6a46c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488336/normal_5fd6233ed4d6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369333/normal_5fd799419f154.pdfIn PDF document text
    • https://vapomawuwe.weebly.com/uploads/1/3/1/3/131398268/8052793.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405430/normal_5ff212de4825b.pdfIn PDF document text
    • https://federadedeladol.weebly.com/uploads/1/3/4/6/134626130/5309927.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410702/normal_600bca17f23a1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luzeparuzibez.rf.gd/xifujowevu.pdfIn PDF document text
    • http://devoleresi.rf.gd/36602998136.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_off0000d7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C2 5664 bytes
SHA-256: 3ac4b74461526df2c5c572f1a77ed8ee95ea4f86efc827c16e49c29ca4042496
font_01_sfnt_off0000eafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFE 10320 bytes
SHA-256: 9e2ab3afbe3372a29dd8db8e1db8f10cfadb29ef58910278ed296f397d118959

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