Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f0f569ef52dc8f0…

MALICIOUS

PDF

68.3 KB Created: 2021-03-18 02:10:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5d675bf86996169d6e94ff0c2798983 SHA-1: 28a85a84a435c8a12ceb78f93c6157d166669f0c SHA-256: 8f0f569ef52dc8f0544909cea57bd73e92b006f182a0efa5d8e4a48cf15e0c37
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a URL related to game cheats, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a link farm used to redirect users to malicious sites.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/wix?keyword=war+commander+rogue+assault+gold+cheat
    • https://static.s123-cdn-static.com/uploads/4482631/normal_5fe40763407d7.pdf
    • https://cdn-cms.f-static.net/uploads/4393204/normal_6051eacbc08b9.pdf
    • https://static.s123-cdn-static.com/uploads/4390999/normal_5ff4dca7e72a6.pdf
    • https://cdn.sqhk.co/nuvexajamu/hxoHxja/rezudesumusojat.pdf
    • https://static.s123-cdn-static.com/uploads/4373519/normal_5fe51358ce952.pdf
    • https://cdn.sqhk.co/mofijovelu/Iiihgib/free_roam_open_world_games_ps4.pdf
    • https://cdn-cms.f-static.net/uploads/4476941/normal_604edf4603ff6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1aa3da75-d0b8-4aea-80c5-09b5f7dec593/how_to_turn_indesign_file_into.pdf
    • https://11e0ccb5-01dd-4757-ae93-f6f3b4f5ca32.filesusr.com/ugd/1a2ce6_8052503a11f8408599be20c385ea18a4.pdf?index=true
    • https://d4f1f58f-bd44-402a-a4b0-a3aa01e36dbf.filesusr.com/ugd/dffefa_ce9915c35366453f8db4d778e13c59b1.pdf?index=true
    • https://s3.amazonaws.com/rujimidujek/android_google_dark_mode.pdf
    • https://s3.amazonaws.com/wemazun/55531202735.pdf
    • https://s3.amazonaws.com/rurosaveruk/7731910849.pdf
    • https://uploads.strikinglycdn.com/files/f0c4a7d9-54eb-4fd6-8475-d5f5898cd9d1/81577309195.pdf
    • https://367e539a-c541-4439-991c-4bf2bef2aa7a.filesusr.com/ugd/77d535_1fa3501f76ef4ecb908c7d24da93554e.pdf?index=true
    • https://s3.amazonaws.com/wozoxub/lovivujufegizojegoxanod.pdf
    • https://27f1a270-5048-4778-87f0-574dfe85248a.filesusr.com/ugd/b7306e_a720c480d26143449554eb71447adc58.pdf?index=true
    • https://s3.amazonaws.com/rogugagatuf/12764385931.pdf
    • https://d4996ccb-aecf-47c4-aab6-3c4fe022e1b7.filesusr.com/ugd/b7ed05_4b283fe7e5b54612a1d0111d47efee0e.pdf?index=true
    • https://s3.amazonaws.com/vojapu/50021357770.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_off0000cebd.bin
29c895b9afc5846d9098b6a8ea007c77905a05c8a2f243eac1be702751e6b11f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBD 5364 bytes
font_01_sfnt_off0000e0d9.bin
3fe0ab782580db38644a0c1860f84954749082948eca00b091808b5277bbf01b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D9 10212 bytes

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