Malicious PDF — malware analysis report

Static analysis result for SHA-256 983c15cbedd07a31…

MALICIOUS

PDF

73.8 KB Created: 2021-04-08 20:22:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 370427c7249764998bf9bc903cb1a021 SHA-1: dc3efa1cc3d8959ab5d426c89a2360acfc004218 SHA-256: 983c15cbedd07a3124402389515748e1fae86e92b3f0744c9a5747513f220871
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, with one prominent URL pointing to 'bologen.ru' which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to educational materials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/strik?utm_term=grammar+textbook+pdf+class+9 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465149/normal_60165fae572af.pdfIn PDF document text
    • http://fitokaps.xyz/character_customization_template_episodejxqtj.pdfIn PDF document text
    • http://bubble1.space/encase_certified_examiner_study_guidewho7d.pdfIn PDF document text
    • http://trellos.fun/hp_laserjet_pro_400_m401a_printer_driver_download_for_windows_71cif3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403533/normal_60675a0983530.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452588/normal_5ff4f35c624d1.pdfIn PDF document text
    • http://keepxufi.space/best_emotional_intelligence_books_for_toddlerskszm2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476925/normal_603e1799e5862.pdfIn PDF document text
    • http://businesshelpservice.com/beworiwowekusia4m.pdfIn PDF document text
    • http://xoxuvajes.mywebcommunity.org/72138264374.pdfIn PDF document text
    • http://mujudesuxiropa.sportsontheweb.net/39767950633.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391314/normal_6061f4e7649e0.pdfIn PDF document text
    • http://kushtanash.ru/74419145843f4j00.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/78dfc83e-543c-4acb-ba1b-9a0054132167/dell_optiplex_gx620_memory_specs.pdfIn PDF document text
    • http://rabelinowizufe.myartsonline.com/potinalikodopegodiwo.pdfIn PDF document text
    • https://7f993087-45f6-41f4-96e5-9dcaca18fb91.filesusr.com/ugd/9a92dd_b46925537ba34139ba14cbe48766c003.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d7cf9e3-7f64-4a69-a47c-56cb4ce0080a/how_to_open_sentry_safe_p005c_without_combination.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e706532d-cb24-4f8a-a746-9e2e4f9c2d51/spoken_english_online_courses_in_india.pdfIn PDF document text
    • https://625f08e2-3d8e-45b5-8e8c-b95d001c5c7c.filesusr.com/ugd/d94ae5_996194d528f34c43bc4d2604ace4f015.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ab2c3a9-6ffa-42ad-b322-4c80d6df86c3/how_to_snap_together_a_snuggle_blanket.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d89eddc4-52b8-4415-a470-68cb43d0aac2/24240624793.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE150 5760 bytes
SHA-256: a3625c0c790ec54cf75ca01ab7521bf9be75d3afb877496d1998f97cd35d9cff
font_01_sfnt_off0000f4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DD 10816 bytes
SHA-256: a197c34ec4bc63a919892dd30e4eda2fccb79a8a06543ddf7305db5e12a57264

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