Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5f5ed358f1296e0…

MALICIOUS

PDF

94.2 KB Created: 2021-03-12 17:44:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: cc251c4dd65ca7304ca6a2c8923a48c7 SHA-1: 41707799d6338d44d577ad36b066c2f254f689a7 SHA-256: a5f5ed358f1296e02de57a9919168cf5146bc729a272ff069d8526819fdc7568
96 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is part of a link farm, with numerous external URLs embedded. One prominent URL, 'https://mezovuduw.ru/wix?keyword=art+history+4th+edition+marilyn+stokstad+pdf', suggests a lure to a website disguised as a search result for a book. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest an attempt to redirect users to malicious content, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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.
  • 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://mezovuduw.ru/wix?keyword=art+history+4th+edition+marilyn+stokstad+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403940/normal_5fdaf5ea00880.pdfIn PDF document text
    • https://cdn.sqhk.co/kekelivig/jiie9YJ/tideguvegizuzanaxu.pdfIn PDF document text
    • https://cdn.sqhk.co/bopelara/ShdcEge/wonilimagativozuxawubulu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385020/normal_601485628f60e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454984/normal_60304d3fd3aa5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425933/normal_5fed51060f6d7.pdfIn PDF document text
    • https://cdn.sqhk.co/vawadawuleja/hfjbDu0/fallout_shelter_game_show_gauntlet_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/fuzokikili/Yvjaouv/pumutoxagazirixibud.pdfIn PDF document text
    • https://cdn.sqhk.co/xizefonuma/Zghejhs/36293846508.pdfIn PDF document text
    • https://cdn.sqhk.co/vozeseseber/jZmVjcc/itopya_pc_toplama_sikayet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461234/normal_5feb94782704d.pdfIn PDF document text
    • https://cdn.sqhk.co/jolodovi/ez47Tib/mx_player_ashram_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490380/normal_6017b2e21c83f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484122/normal_5fe687103a046.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391621/normal_5fd2ecebdcac8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427104/normal_6044ae35a1898.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478123/normal_60442415710a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372373/normal_6018bbca41a9e.pdfIn PDF document text
    • https://cdn.sqhk.co/mapetidul/8ijjhjj/karewideponaligod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6d4cd3b7-91e9-43ac-92b9-205473f1e50d.filesusr.com/ugd/28146e_6a5b65b4259a49f6a48ce0e18bc1b438.pdf?index=trueIn PDF document text
    • https://9a1eab6f-da2d-4a41-99bb-18a59f11b130.filesusr.com/ugd/c2b690_954a2826e0374ac8be06a3636c6302d0.pdf?index=trueIn PDF document text
    • https://dd3528e8-ded0-4753-843e-0d3cb9f542e7.filesusr.com/ugd/4d6844_e34494e39c824134ac75a42aa86fa5de.pdf?index=trueIn 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_off00013554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13554 5524 bytes
SHA-256: f51a9c1fa3aa19a90529ea615e782f8814b66908e3c1894cf8970c49886c2c66
font_01_sfnt_off00014806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14806 10304 bytes
SHA-256: e6952b45a71ff462e7baee1ce02a7e92dc5df21e7355c398c12aeb21d4791a9f

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