Malicious PDF — malware analysis report

Static analysis result for SHA-256 5823ea60715ce27d…

MALICIOUS

PDF

59.0 KB Created: 2020-11-24 11:13:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 335726777ace0ccf4e521f6fd10f5c8e SHA-1: f8528faedf02ecf2452269bc3e454e5867ba8898 SHA-256: 5823ea60715ce27da0f92cf3bb5ab3bf40ea6355a0ecf2d48c2ef45bd47c14ca
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains heuristics indicating it is part of a link farm and has been flagged by a machine learning classifier and ClamAV as malicious. The document body, though heavily obfuscated, contains text related to plagiarism software and the wkhtmltopdf application, suggesting a lure. The embedded URLs point to external sites, with one specifically being a search query, indicating a potential phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8007

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
  • 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.
  • 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://trafffe.ru/wb?keyword=detect%20plagiarism%20software%20free PDF link annotation
    • https://waxagenejefud.weebly.com/uploads/1/3/4/7/134712445/9157550.pdfIn PDF document text
    • https://walijogopabo.weebly.com/uploads/1/3/0/7/130776167/d0e99b7638402.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470523/normal_5fb7077cd373f.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e66e9e5f-8a73-41a2-8099-cdf7d6e0a2c0/99870510231.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/246f8e63-c590-43bc-9b26-dfe1f4e2cb60/mejazolom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9c72c8c-2ab6-432e-aad4-645a19ad4e11/86455443940.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0651f556-bf98-4cbe-a241-1223fc178c74/xinaduneranozefafafenume.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9297f794-ebf5-4123-86a9-eb8c0028cd54/funny_baby_picture_with_big_weiners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d4a24d9-4369-4765-b0c7-93849d6c6e20/stoopid_monkey_hbo_productions_lbs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5ab5999-da53-447d-a789-e786be212c4c/62433295154.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b31c513a-9523-418e-83f7-b4f404462107/34395218821.pdfIn PDF document text
    • https://s3.amazonaws.com/fenatagazise/52030727481.pdfIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70B 2920 bytes
SHA-256: a986119c16e44081cc8e25afede66da4c613bf9b2bda1169c6dfb8b692a7cff1

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