Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb1f5932a16dcffb…

MALICIOUS

PDF

99.5 KB Created: 2020-11-25 21:59:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: e459dbf571da8806c174dc26b4a18d05 SHA-1: d26b27ded8d5b6dd87cc05e90e0ece86af6a08b2 SHA-256: cb1f5932a16dcffb58cef0d3368f12eaac66b6b8eacaacc4157a4035b1eebfaf
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, including one pointing to a suspicious URL that appears to be part of a link farm. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs users to copy and paste content into a command-line interface, a common tactic for executing downloaded payloads. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffe.ru/strik?utm_term=windows+7+64bit+torrents PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366369/normal_5f88ede3a234e.pdfIn PDF document text
    • https://poxusesemeli.weebly.com/uploads/1/3/4/4/134462398/raxavavafalorutosa.pdfIn PDF document text
    • https://tadafami.weebly.com/uploads/1/3/4/3/134386911/3772432.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369646/normal_5f9cc6dbed153.pdfIn PDF document text
    • https://porelananov.weebly.com/uploads/1/3/0/7/130775759/midasugexopaguw.pdfIn PDF document text
    • https://rigitugatelimo.weebly.com/uploads/1/3/4/1/134131632/b12ac7e515e31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379476/normal_5fb4f6632856e.pdfIn PDF document text
    • https://sedanafijokam.weebly.com/uploads/1/3/4/8/134888359/5027982.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gozilum/90207467259.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/macroeconomia_blanchard_italiano.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/76965685791.pdfIn PDF document text
    • https://s3.amazonaws.com/nabifovu/sudinidipasuwut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3bee17c-33f6-4d65-a17a-521da76b1f28/sickle_cell_anemia_pedigree_worksheet_answers.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001372d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1372D 4932 bytes
SHA-256: 6936921813428b8d1ef0dfbbfa66ced30ce27d1152fd3dd6e4840548a51453d0
font_01_sfnt_off0001481b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1481B 13220 bytes
SHA-256: 520472eb74bc18f14ba7788944e01ef6b302056cf879e36b96d79d3138082036
font_02_sfnt_off0001733a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1733A 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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