Malicious PDF — malware analysis report

Static analysis result for SHA-256 bac5ee57741f688e…

MALICIOUS

PDF

77.9 KB Created: 2021-05-07 00:19:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 60c54aece5d83582923c3e9252449350 SHA-1: 982deb2bfe657e3529e009cc2ffece9d355a3139 SHA-256: bac5ee57741f688e4e62213197b5dd074cff1e4901fcbfdda663270a01a3da74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, with one suspicious URL identified as a potential distribution point for malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristics suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://xezojetit.ru/strik?utm_term=how+he+loves+us+so+lyrics
    • https://cdn.sqhk.co/waxobakal/IzhbqS5/the_room_place_locations_in_chicago.pdf
    • https://cdn.sqhk.co/depivuni/ajaN2jf/57352983421.pdf
    • https://cdn.sqhk.co/vafodagusun/heKgfDv/epic_minecraft_seeds_pe.pdf
    • https://cdn.sqhk.co/jinubodilev/Vjcijuh/pop_music_songs_2020.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0ca93bd7-f1d1-42ba-be09-48215340cd08/nugidovomubak.pdf
    • https://d4e73f68-9870-4c81-be0c-0a6dd7607cd2.filesusr.com/ugd/6f53d7_13f11d9bdf8d4edab71d159dbbdd22aa.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7103ac9a-8be4-4f8d-8177-840537a35077/flip_video_camera_battery_removal.pdf
    • https://uploads.strikinglycdn.com/files/b5b77743-b0bd-4f9c-bdeb-6971c39f1044/66573298609.pdf
    • https://1de4b56a-3309-4767-83a2-f1bb1ea7c594.filesusr.com/ugd/a6e5e9_2a9ad200b0ce44d68b00ffbc62df8249.pdf?index=true
    • https://b67fa923-03b4-4d21-b555-95ff628d7525.filesusr.com/ugd/1d4b90_ae2a50ca47a54776ba309dc575828e88.pdf?index=true
    • https://d45de9d9-8116-4232-9203-1b9506c390e4.filesusr.com/ugd/a69a10_7d28c55806df431580ff2507981a3630.pdf?index=true
    • https://uploads.strikinglycdn.com/files/da9a9c80-c9ae-4cb3-b085-e4b800e1a6c4/apocalyptic_witchcraft_records.pdf
    • https://uploads.strikinglycdn.com/files/6be9688b-9bec-46db-97dc-5d9cf219867c/xulajepibovepov.pdf
    • https://uploads.strikinglycdn.com/files/505c4661-1e73-438a-8581-b61b2d2c74f3/90608916511.pdf
    • https://uploads.strikinglycdn.com/files/1fd16925-806e-4342-82fa-7bacf22d93a3/jisekikipawupilufekilibe.pdf
    • https://uploads.strikinglycdn.com/files/9940d9cd-f035-4607-83ea-8ea8ab93081d/can_echo_and_google_home_work_together.pdf
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f183.bin
b27d4b7269ddef27e6e39698b076ad9f9b8aba6079be7e3bdc9527c88c7324a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF183 4892 bytes
font_01_sfnt_off0001023e.bin
f6e981b057fb227640dc9ec238eddb419e7ab22d0ed8dcc35419b0262765459c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1023E 11600 bytes

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