Malicious PDF — malware analysis report

Static analysis result for SHA-256 481ad5093a74ca56…

MALICIOUS

PDF

81.5 KB Created: 2021-04-09 04:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed434185b62003f605d60b81ddb28e1f SHA-1: dd0abe11fc358ca620946a5f1ec893fbfdf147ce SHA-256: 481ad5093a74ca56d11897055a3df20074aa212e9c8f0ec6bc2a9ab6544b6a68
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on benign-looking domains but point to potentially malicious content. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting a phishing or redirection attempt. The primary malicious URL identified is 'https://botokaw.ru/strik?utm_term=why+my+iphone+hdmi+cable+is+not+working', which is likely used to redirect the user to a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/strik?utm_term=why+my+iphone+hdmi+cable+is+not+working
    • https://cdn.sqhk.co/ragonujip/g3MhiqY/buzzr_on_pluto_tv_not_working.pdf
    • https://cdn.sqhk.co/pixukinoma/v6Vtiew/9129715885.pdf
    • https://cdn.sqhk.co/xoradofexul/ajbR2e7/twitter_advanced_search_date_range.pdf
    • https://cdn.sqhk.co/befozaxulot/cjfjERw/81402243654.pdf
    • http://wide-do.top/wadolenibokigoxurf6g1a.pdf
    • http://odemebayisitrafik.com/zuwitatixegonuwsvf2u.pdf
    • https://cdn.sqhk.co/bepeguvovori/jhTghje/troll_face_quest_game_of_trolls_level_6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/taguxif/84401089695.pdf
    • https://uploads.strikinglycdn.com/files/a6de4803-e5a2-45ef-aba1-9ffeb46980f6/is_there_really_a_drunken_martial_art.pdf
    • https://s3.amazonaws.com/dudurat/free_preschool_worksheets_for_3_year_olds.pdf
    • https://s3.amazonaws.com/polojuliragam/46034080902.pdf
    • https://s3.amazonaws.com/rikolesafuwofar/gracybee_size_guide.pdf
    • https://s3.amazonaws.com/roware/55384824710.pdf
    • https://s3.amazonaws.com/xewamejixolefaj/bemisumivuvuxinakufikejet.pdf
    • https://s3.amazonaws.com/damerirazib/m9_bayonet_marble_fade_guide.pdf
    • https://01c19f78-c7d0-441a-b56a-8672493f87de.filesusr.com/ugd/9d66c7_259c25e181334200861ac8ea6b897933.pdf?index=true
    • https://ad858f6a-7bbb-416d-9365-e04d7986ed9b.filesusr.com/ugd/3c9ac1_9ff0634ee057416db245e4a5a7695406.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5e8d8068-73d3-4ff8-93c9-0e37e002b2d7/bhagavad_gita_in_tamil_quotes.pdf
    • https://s3.amazonaws.com/lorifawuvawot/71451903748.pdf
    • https://e1ca4115-fb55-43f9-84f1-eaf814f8c83f.filesusr.com/ugd/18122d_26e082ad76b74778b9cac4cf05658363.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_off0000efa9.bin
634447cd0a85a12a1c54bb2bdba9fa97fb060a22ea2c71d83452814bc9991651		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA9 5688 bytes
font_01_sfnt_off000102df.bin
38c5d444303eafa135544f2c28b8325c489fea16854f8e61252069b9b678d2b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102DF 11084 bytes
font_02_sfnt_off0001289e.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1289E 4324 bytes

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