Malicious PDF — malware analysis report

Static analysis result for SHA-256 93cb8616901ba7c3…

MALICIOUS

PDF

94.4 KB Created: 2021-04-19 23:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 313a3b34e80dfbf9aa9ed49332018e8a SHA-1: 2a9d13c3a2957743b80721f4f79d097639aff0f2 SHA-256: 93cb8616901ba7c3b7daff06c7912f3056b02ff060c3e469f8272e3fa667bac6
96 Risk Score

Malware Insights

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

The PDF contains an embedded URL that directs users to a site offering 'gre math subject test practice problems', which is a common lure for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload. No scripts were extracted, but the PDF structure and embedded URI are sufficient indicators.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://jumiwimov.ru/strik?utm_term=gre+math+subject+test+practice+problems PDF link annotation
    • https://cdn.sqhk.co/dapubebireba/1iVlheX/far_horizons_east_mobile_homes_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/vefomatakin/aQgh6gh/fatutojugu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370263/normal_60558c44a015b.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/PibLjcP/clothes_worksheets_clipart.pdfIn PDF document text
    • https://cdn.sqhk.co/dusaradezat/ghsmhcM/lovecraft_untold_stories_gamefaqs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457572/normal_604365e632c95.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisimak/LBqe0jh/old_man_s_journey_achievements.pdfIn PDF document text
    • https://cdn.sqhk.co/potebuso/eVhgo9J/gym_slacker_meme.pdfIn PDF document text
    • https://cdn.sqhk.co/libegavezu/ieB3Khc/jolebibemodugosaze.pdfIn PDF document text
    • https://cdn.sqhk.co/kululojilo/hihcw5F/fifa_soccer_rules_of_the_game.pdfIn PDF document text
    • https://cdn.sqhk.co/jomububorava/dYTmjdF/cross_wallpaper_for_desktop.pdfIn PDF document text
    • http://bluetea.space/72963441147y5hno.pdfIn PDF document text
    • https://cdn.sqhk.co/putomikoluku/lwmujjg/halloween_decorations_outdoor_amazon.pdfIn PDF document text
    • http://piredvizhnik.com/611684862522vo12.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/c6b027af-62cb-4f0f-908d-4898543ffd3f/presto_pressure_canner_23_quart_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/scientific_calculator_exe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc72152f-e2c9-4434-b09a-868f20d596e3/omron_bp785n_10_series_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/gedexim/69032419294.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b87cf19-5a43-42b5-8c79-e414bf200580/suxepi.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF6 5420 bytes
SHA-256: a4bff828800747df0cdb36dc950aebe69c21de9f75a329898e1edf780399d0e9
font_01_sfnt_off00012f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F34 11524 bytes
SHA-256: 2c066c33484d0cea53b0381bac6334731449056597d0c0df2a0d589f3edd256b
font_02_sfnt_off000156a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156A0 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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