Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecfe5a9e4b10aad3…

MALICIOUS

PDF

51.6 KB Created: 2020-12-14 23:21:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 85f6f25ed25f011894c3dde1f7974c6f SHA-1: 9ac9aa4d1a9a879da9ac3f0bfceaf6856d73448d SHA-256: ecfe5a9e4b10aad33bc2e47e15593aa74802067522291458b5a602aa76410ed1
212 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector at 'traffmen.ru'. The document body, though heavily obfuscated, suggests a lure related to a computer hardware manual. The presence of multiple external PDF links indicates a link farm strategy, likely to distribute malware or conduct phishing. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8466

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.
  • 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
  • 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=asus+maximus+ix+hero+manual+pdf
    • https://kaxutaxi.weebly.com/uploads/1/3/4/3/134387751/6ea23e2b0.pdf
    • https://static.s123-cdn-static.com/uploads/4487918/normal_5fc5242941e9c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc18f8d0a2757459be7919f/t/5fd206c48ba64b78df5b3400/1607599812343/79778641919.pdf
    • https://s3.amazonaws.com/kizugokofo/kitavujez.pdf
    • https://uploads.strikinglycdn.com/files/6ccecf05-1147-455c-bcc0-43cedac34f8b/24401671051.pdf
    • https://s3.amazonaws.com/wejuvono/46137976879.pdf
    • https://static1.squarespace.com/static/5fc5cf0117e72026400bb701/t/5fcfdc981ce5cc3a1100d386/1607457948530/53212946107.pdf
    • https://s3.amazonaws.com/divikufifir/mitegiduru.pdf
    • https://s3.amazonaws.com/fotojipifuzitul/thalassemia_guideline_tif.pdf
    • https://s3.amazonaws.com/bejokazemur/customer_service_rep_interview_questions_and_answers.pdf
    • https://s3.amazonaws.com/xopugup/26223474246.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b078.bin
01dbcc0951159842cccfb64bb89f4d9edb9ed9726b7024858bda5096e702eb82		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB078 5340 bytes

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