Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cb78c39524432a1…

MALICIOUS

PDF

76.4 KB Created: 2021-03-12 03:25:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 00842f9f1a356eaf47ecb0740e92c360 SHA-1: a4a876987115056345bf9669cb76af955d5fce91 SHA-256: 9cb78c39524432a192a849a3a42b52512de275b00090cb8e05770dc89a1b968a
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojanized document. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a malicious site. The document body, though heavily obfuscated, contains text that appears to be a lure related to martial arts, combined with metadata from the wkhtmltopdf tool.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://xajibur.ru/strik?utm_term=2nd+degree+black+belt+bjj PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4401983/normal_600afcd352bca.pdfIn PDF document text
    • http://patedeziw.mypressonline.com/sukonupunop.pdfIn PDF document text
    • http://vodabutopidaru.getenjoyment.net/fifilajejefatelukulijin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419628/normal_602263620baa8.pdfIn PDF document text
    • http://vajesafosedepur.mywebcommunity.org/how_to_activate_pvr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455180/normal_60109603e8ed2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474752/normal_5fcc5115caefd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386094/normal_5ffd3bd7ee8ed.pdfIn PDF document text
    • http://pikejofopon.mypressonline.com/juzafu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484633/normal_5ff64b32a3d2e.pdfIn PDF document text
    • http://zejenaxudemato.22web.org/bend_it_like_beckham_full_movie.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384050/normal_6048a8fab5fcd.pdfIn PDF document text
    • http://xufededubumavif.scienceontheweb.net/kowazuk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446762/normal_5ffb364f4e3d2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/18b77d13-17f7-404b-8dee-ba854741fc9c/zorubiwigepibezefi.pdfIn PDF document text
    • http://dowibisewapidon.rf.gd/12739793694.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/775d2af3-58e3-44d6-a1a6-6054433282f7/jonuvalutaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c929a095-4d43-4070-8881-ca87a8994d83/trunk_control_test_tct.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd44c17b-b757-46e6-9e5b-96e7e39289ab/how_to_update_zoom_outlook_plugin.pdfIn PDF document text
    • http://kuwopugivowivo.rf.gd/239389211.pdfIn PDF document text
    • http://nupuzawov.onlinewebshop.net/jexaxunedir.pdfIn PDF document text
    • http://juvudujaxajiji.epizy.com/a_guidebook_to_mechanism_in_organic_chemistry.pdfIn PDF document text
    • http://nofolimuri.myartsonline.com/short_story_download.pdfIn PDF document text
    • http://rogomore.myartsonline.com/certificado_medico_forense_bolivia.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E3 4876 bytes
SHA-256: 37be4b48604e3c1990c12644a80155e592d164141972068f137ffcb1670b0d45
font_01_sfnt_off0000f183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF183 10288 bytes
SHA-256: c74022667cf323ea1ba7cd0f01780eec413cb7db343bc6c8a7ad60dc0ddfab19
font_02_sfnt_off000114c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C7 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3