Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c5af03472261fe8…

MALICIOUS

PDF

49.6 KB Created: 2020-12-06 03:10:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 552c409d35fc39ce54bb10ef459f83cd SHA-1: fc45374973129994ad45abeb07ad443086837099 SHA-256: 5c5af03472261fe80e02ea42ee78e3aa37e1a0cbb1db788968a883a63a51fbfc
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains a large number of external links, many pointing to disposable hosting, and one primary URL that appears to be a redirector. The PDF's structure suggests it's an image-based lure designed to trick users into clicking through to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9421

Heuristics 6

  • 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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 49 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffnew.ru/strik?utm_term=organic+chemistry+solution+manual
    • https://dukitupa.weebly.com/uploads/1/3/4/3/134393571/3254709.pdf
    • https://wogijelagorezu.weebly.com/uploads/1/3/4/0/134096035/a18adb6a51650.pdf
    • https://static.s123-cdn-static.com/uploads/4498883/normal_5fcc0f56b6790.pdf
    • https://cdn-cms.f-static.net/uploads/4388614/normal_5fb4dc9e33517.pdf
    • https://sarutofujatazix.weebly.com/uploads/1/3/4/5/134584212/mivenosujexe.pdf
    • https://jusemeki.weebly.com/uploads/1/3/4/5/134506960/molusinipefa-rajuxirev-toxiberuwazojej.pdf
    • https://cdn-cms.f-static.net/uploads/4378845/normal_5f8a3f49916a9.pdf
    • https://tupivoxutod.weebly.com/uploads/1/3/4/4/134467409/nuraje_guropiso_wonel_jenosepabe.pdf
    • https://cdn-cms.f-static.net/uploads/4373987/normal_5f9a76f7816df.pdf
    • https://s3.amazonaws.com/risisipajole/brass_band_sheet_music_australia.pdf
    • https://static1.squarespace.com/static/5fc136563398ff7515300e75/t/5fc3ba942dd96f59185fbff1/1606662807378/11622814748.pdf
    • https://uploads.strikinglycdn.com/files/5535b0a9-f5b9-4f6c-84e2-302e70dc171c/16282178446.pdf
    • https://s3.amazonaws.com/jefazaxal/jozizezasan.pdf
    • https://s3.amazonaws.com/juzalizuvar/ligovoka.pdf

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