Malicious PDF — malware analysis report

Static analysis result for SHA-256 6658fdadbf519237…

MALICIOUS

PDF

77.9 KB Created: 2020-12-26 09:45:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 32b02cee6821509872e2b1a76c9b39f0 SHA-1: 42f15aa1491ad2249a1ce5c940b138e7acc9b151 SHA-256: 6658fdadbf5192371ee4d532a2c670cf772626b6cc3dc43f4afb4bc405c751bd
196 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier. A critical heuristic indicates it's a PDF link farm, and another high heuristic points to a clipboard command lure, suggesting the document prompts users to execute commands. The embedded URLs, particularly the one pointing to 'trafffi.ru', are suspicious and likely part of the attack chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/123?utm_term=sony+dvpsr510h+dvd+player+region+free PDF link annotation
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/3635013.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxumisi/Sg9ILou/summoner_era_arena_of_heroes_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/marixefe/cNz9gew/sorosesasuli.pdfIn PDF document text
    • https://demaromut.weebly.com/uploads/1/3/4/3/134358025/mijileripaburufaxu.pdfIn PDF document text
    • https://cdn.sqhk.co/nerenina/2alNMhe/viramagovoxikufutafopo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8393654f-6479-443b-a693-0d4e736191ee/7019098829.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1ba1077-f3fd-4251-b324-00278480eb5d/8932960029.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b420c258-6972-4005-9f5e-4dfe267dd094/zalisezoxuzed.pdfIn PDF document text
    • https://s3.amazonaws.com/leributafa/motojegajipumowadaxozalu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d7fbc1b-901a-4fa1-9f7f-8b14e30d2945/gta_sa_cheat_menu_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1a0d64f-0115-4d74-9fe6-5bdd08001aad/43814253356.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad98c6d1-878a-4bd3-894f-688e739f7379/asus_laptop_charger_19v_1.75a_33w.pdfIn PDF document text
    • https://s3.amazonaws.com/kizuporowefib/how_to_delete_twitch_account.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a024f92-a774-4d90-aeef-b518235e68b1/total_war_warhammer_bretonnia_army_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25d307c0-f31d-4d21-ad72-b3017f73379b/1044838795.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1ED 5888 bytes
SHA-256: 99f18d9b1ef286730d8657b43c486ef021deadc167fe857111e273cdea300bff
font_01_sfnt_off00010610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10610 10536 bytes
SHA-256: d39f97babc56f95e374ac5d81d4f476b78d5e7966f409bd9d9036bfabb3c6b9a

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