Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa80f3388f54c9d8…

MALICIOUS

PDF

51.0 KB Created: 2021-04-21 04:41:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6e7b3ad3866550c9acc8bd7bd644c094 SHA-1: 34d005b2dcb2382f8cc4535ef4e7ea0aa2956390 SHA-256: aa80f3388f54c9d8fc412ae11b77a84b68fbb4dcdea116878ecb9aba1d0933ee
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable link. The heuristic PDF_IMAGE_LURE indicates a typical shape for a phishing document. The primary URL, https://maypoin.ru/strik?utm_term=effectrode+blackbird+vacuum+tube+preamp, is likely the destination for the malicious click.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7515

Heuristics 5

  • 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 51 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://maypoin.ru/strik?utm_term=effectrode+blackbird+vacuum+tube+preamp
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    • https://s3.amazonaws.com/sepawi/manual_versus_automated_testing.pdf
    • https://uploads.strikinglycdn.com/files/19cf5f15-1d10-4bf3-ae08-2ac983391686/lavidoruvikedefosebox.pdf
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    • http://josesomesube.myartsonline.com/how_to_reorder_pages_in_adobe_reader.pdf
    • https://6196a4e6-b3b5-4a85-a139-4ec84e0a53d9.filesusr.com/ugd/d01287_8cab0f32d1534026a8f9565b50c10fa0.pdf?index=true
    • https://s3.amazonaws.com/selivuvumepaveb/kexojaturagidunafalefije.pdf
    • https://ee42ee57-4547-4a8c-8a66-6cccb7f6869d.filesusr.com/ugd/2a9ad2_49f7c4f0cd384b29a28a1b41e761dd36.pdf?index=true
    • https://s3.amazonaws.com/marimejerebo/lavefatexo.pdf

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