Malicious PDF — malware analysis report

Static analysis result for SHA-256 10fbc6324cf7701f…

MALICIOUS

PDF

75.7 KB Created: 2020-12-22 17:33:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc967fbf4b716c823adad57201ab734c SHA-1: d62d3c7b154ebe7ebf5ada17459cffdd2dc38812 SHA-256: 10fbc6324cf7701fee58030cb6193a7f266084ec34d2c8e627d4c0650ea541c9
214 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large number of external links, suggesting a link farm designed to distribute malware or phish users. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the embedded URLs and the nature of the heuristics strongly indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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
  • 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://traffmen.ru/strik?utm_term=strategy+consulting+firms+ranking
    • https://jitebemaduk.weebly.com/uploads/1/3/4/6/134692965/2467359.pdf
    • https://rinulokol.weebly.com/uploads/1/3/4/8/134868038/vatorisogop-limebubikero-nabexuvojirir.pdf
    • https://nuxirudeduw.weebly.com/uploads/1/3/4/4/134442083/393a49760d.pdf
    • https://fafefojesuvun.weebly.com/uploads/1/3/4/6/134651362/lofada-sizew-durepavagonixa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/01ac04a2-c3be-45b8-9ce7-59ebc09a37eb/lesavisuwuzo.pdf
    • https://s3.amazonaws.com/sezebepit/86994002021.pdf
    • https://s3.amazonaws.com/dudurat/cisa_questions_and_answers_free.pdf
    • https://uploads.strikinglycdn.com/files/ec9b121f-360c-4ad7-b771-53605081da8a/kerubejurasuz.pdf
    • https://s3.amazonaws.com/vopadofugon/kopetomakezaleranadazipe.pdf
    • https://s3.amazonaws.com/ganubifirigevi/zabofubuxijagumurofi.pdf
    • https://s3.amazonaws.com/megulu/vegago.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_off0000ddea.bin
ada7c410b42b5df536538301b63977021fc5d6b3d69c124a945d5a57504b3935		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEA 5352 bytes
font_01_sfnt_off0000f007.bin
4f0e3f68ff77045cf695898367519b9e4bac18dc2c911cc99f7c6b38afaec103		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF007 10432 bytes
font_02_sfnt_off00011398.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11398 4324 bytes

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