Malicious PDF — malware analysis report

Static analysis result for SHA-256 125bfdf9797bb6cc…

MALICIOUS

PDF

86.6 KB Created: 2021-06-01 07:22:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 33a34ba40d1ff40b2c029434f2b82f3b SHA-1: 9abcb52b4bf38528b4783c1dea222bb2dba08fcb SHA-256: 125bfdf9797bb6cc6dcf66188030f7c99900c24c941693af24acd59d31c7337d
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a primary focus on 'https://crysiq.ru/pbw?utm_term=baka+to+test+to+shoukanjuu+mini+anime'. Heuristics indicate this is a link farm on disposable hosting, and ClamAV detection confirms it as 'Pdf.Phishing.Trojan'. The document body, though partially garbled, contains references to anime and the wkhtmltopdf tool, suggesting a lure to disguise malicious intent. No scripts were extracted, but the overall structure and URL reputation point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://crysiq.ru/pbw?utm_term=baka+to+test+to+shoukanjuu+mini+anime PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369651/normal_601b0e5376499.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458634/normal_60581ac774162.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369657/normal_60086bdc969df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443574/normal_602f88ab11830.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367951/normal_605da64595d50.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462736/normal_5fcc0262879b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466680/normal_604d330352068.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374374/normal_603da41adda75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425010/normal_60661c65dd084.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://banusiv.pbworks.com/f/call_of_duty_mobile_android_problem.pdfIn PDF document text
    • http://kokoxudalux.pbworks.com/w/file/fetch/144420900/98027578767.pdfIn PDF document text
    • http://risoxef.pbworks.com/w/file/fetch/144443238/wordlist_generator_for_brute_force_attack.pdfIn PDF document text
    • http://kinuwibe.pbworks.com/w/file/fetch/144444033/bomber_friends_hack_apk_2020.pdfIn PDF document text
    • http://barumena.pbworks.com/w/file/fetch/144440490/liletizerivixefu.pdfIn PDF document text
    • http://zelovoguvunu.pbworks.com/w/file/fetch/144425988/la_era_de_hielo_3_pelicula_completa_en_espaol_hd.pdfIn PDF document text
    • http://wixugigir.pbworks.com/f/73299471450.pdfIn PDF document text
    • http://wozixokumo.pbworks.com/f/aaa_battery_dimensions.pdfIn PDF document text
    • http://wiwedano.pbworks.com/w/file/fetch/144427773/33357421382.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA62 5232 bytes
SHA-256: d3320a636295b01d32dedfeb505678ee34caefb57f6bf09dd0a0dd3702d4d9f8
font_01_sfnt_off0000fcbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBB 4988 bytes
SHA-256: 7255ec6160d04ce502373128ca229887776c43915ea9653293176ff5d145ebc7
font_02_sfnt_off00010d91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D91 11964 bytes
SHA-256: 1e8d89afa5e3ed296c9acae84966b061f49738efa03e37b8c1c0a4139ceec459
font_03_sfnt_off00013616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13616 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848

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