Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd25a7b373557b0d…

MALICIOUS

PDF

76.0 KB Created: 2021-03-10 15:36:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 804557c913efa883c962a4e043da8fa9 SHA-1: e71332189ad58905eb0e3bfac8e01c08bf449d3a SHA-256: fd25a7b373557b0de7e58692563f4d8d84bd4dc754e0800b7a82f13e8657cff2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, suggesting a link farm or phishing attempt. A critical heuristic indicates a clipboard command execution lure, instructing the user to paste content into a shell, which is a common technique for executing malicious commands. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://bologen.ru/aws?utm_term=premiere+pro+transitions+between+clips
    • https://vokijovagugudis.weebly.com/uploads/1/3/0/7/130776016/xadevuwato.pdf
    • https://zegotasubevit.weebly.com/uploads/1/3/6/0/136097081/zimileruke.pdf
    • http://fuxutigox.mypressonline.com/how_to_keep_score_for_yahtzee.pdf
    • http://jovefupe.mywebcommunity.org/extreme_ownership_free.pdf
    • https://kunolutupevuj.weebly.com/uploads/1/3/4/7/134772201/5061406.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://5d94d51b-2702-4b64-8df3-eadd022f3edc.filesusr.com/ugd/2ddd39_83c26cdc29514b76895405ade215ecff.pdf?index=true
    • https://41be308f-8a64-4dec-8b30-4937605be974.filesusr.com/ugd/f042fe_2cbbf0a34d9e44f8b91ae9b56eb7555f.pdf?index=true
    • https://s3.amazonaws.com/tupofelasujewas/41545401778.pdf
    • https://2eda13a9-9e0f-47dd-bbfa-a9a5028a3314.filesusr.com/ugd/61c57f_6c503e24f63e4cd6a240d8fb457c263f.pdf?index=true
    • https://07e0a16e-b77d-475b-b724-88bbaedb347c.filesusr.com/ugd/8e9e2f_96dccc2ba3154b41822eced79d0897a9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3c672302-f28f-4a21-a909-1094b8016224/gefavabifiluro.pdf
    • https://s3.amazonaws.com/bakoloj/84289597866.pdf
    • https://ca108e69-7b6b-43f0-8f16-d96ebeb8a33d.filesusr.com/ugd/79e0dc_efca14eea0594b93b8ced2060f5c4979.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b9684267-9683-4bd3-8e47-408fb9898744/dowaw.pdf
    • https://s3.amazonaws.com/mixanaz/borderlands_3_ps4_digital.pdf
    • https://fa90eb46-aa9b-4fd1-a2e8-e903ec8e50a4.filesusr.com/ugd/575fb0_c679700c244e4f849fd9aebb15c42685.pdf?index=true
    • https://f238abdf-92e3-4651-90df-65b6e8a648d9.filesusr.com/ugd/99965f_919fd0277367418cbfbe6dc36a64830d.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dffe.bin
cdaed8ff5c3028e4f854492c58b3ca6c8cf6a368ef7e032fafa7aa07e75c3c55		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFE 5100 bytes
font_01_sfnt_off0000f130.bin
19c951b59a4573420166b80505cd837aba20ddd8953f293507a8529b764c2a24		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF130 10452 bytes
font_02_sfnt_off000114ed.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114ED 4324 bytes

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