Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc716123b0625d2d…

MALICIOUS

PDF

77.7 KB Created: 2021-06-09 10:50:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 181cd69681b3907949caa3bb6372bac2 SHA-1: aa8f49d2717befc4852915326b9640aed7e9cbea SHA-256: fc716123b0625d2d3cc3e5ee651bf8201806526146bb3e7922e3078cf981e086
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, with one prominent URL pointing to 'krisoc.ru', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a malicious intent to host a large number of links on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/pbw?utm_term=what+sound+do+a+pig+make
    • https://cdn-cms.f-static.net/uploads/4367007/normal_605307f20025c.pdf
    • https://birinubawode.weebly.com/uploads/1/3/6/0/136026057/2dc511f1573102.pdf
    • https://denafeferigo.weebly.com/uploads/1/3/0/8/130874231/lasavebisitonudita.pdf
    • https://static.s123-cdn-static.com/uploads/4384160/normal_5ff3f77861b3d.pdf
    • https://cdn-cms.f-static.net/uploads/4483097/normal_6062cff94ac91.pdf
    • https://cdn-cms.f-static.net/uploads/4384483/normal_604357fb1874c.pdf
    • https://static.s123-cdn-static.com/uploads/4450251/normal_5ffab6ee3d6ac.pdf
    • https://cdn-cms.f-static.net/uploads/4454163/normal_6057b44d9a4a4.pdf
    • https://cdn-cms.f-static.net/uploads/4379473/normal_601098c229427.pdf
    • https://bovidekomuburo.weebly.com/uploads/1/3/5/3/135312485/pigodixokewefix.pdf
    • https://danifiwap.weebly.com/uploads/1/3/4/5/134585556/e2460.pdf
    • https://static.s123-cdn-static.com/uploads/4499999/normal_5ff21e10dfbc0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/fe3d152e-df18-4317-b40d-d666de56b27e/how_to_replace_dyson_dc44_battery.pdf
    • http://mavujeridolu.pbworks.com/f/84670786784.pdf
    • http://lekipirunezi.pbworks.com/f/practical_applications_in_sports_nutrition.pdf
    • https://uploads.strikinglycdn.com/files/2bf7e213-2bcf-437a-af5b-a96aa9539bd2/panasonic_electric_rice_cooker_recipes.pdf
    • http://bobiginokemo.pbworks.com/f/14907055778.pdf
    • http://jotoxipigi.pbworks.com/f/do_pal_ruka_veer_zaara_mp3_ringtone_download.pdf
    • http://puzavofan.pbworks.com/w/file/fetch/144554559/87086705375.pdf
    • https://uploads.strikinglycdn.com/files/6f032612-ab36-44bb-a163-7575f1fa9f7b/tisibezil.pdf
    • https://uploads.strikinglycdn.com/files/0572e340-c4a4-455c-a0a5-03695aab199f/how_much_do_indian_tv_serial_actors_get_paid.pdf
    • https://uploads.strikinglycdn.com/files/f374fa7c-c97b-44c3-829d-17ba780682ba/how_do_i_reset_my_annke_camera.pdf
    • http://jesababa.pbworks.com/f/iso_14001_internal_audit_checklist_xls.pdf
    • http://togiwuvoze.pbworks.com/w/file/fetch/144590253/taliwufikufamamibowanunal.pdf
    • http://garifukedako.pbworks.com/f/diseo_de_maquinaria_norton_4_edicion_gratis.pdf
    • http://xavewop.pbworks.com/f/buyer_audience_persona_template.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_off0000f3b8.bin
ee261ea35c15f769b5796951030ece844d8d7b5ca85995fefbb6bbb667bf6a9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B8 5324 bytes
font_01_sfnt_off000105bc.bin
c550a1f8a84a2caff8429ca131258faf1c334d26f247a5689ab4023fa5c77716		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105BC 10240 bytes

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