Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3f1f1781b4ea17e…

MALICIOUS

PDF

148.1 KB Created: 2021-04-03 17:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9dc14a35446fbbdbb5cb6b28b3746949 SHA-1: 69903aadd4b653adcc0b38d600fecbb2d804d7b5 SHA-256: c3f1f1781b4ea17eb09d74146209f35419d147dc82712530aa9d48debb0b548a
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable or suspicious domains, suggesting a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a non-clustered link farm on disposable hosting, further supporting the phishing lure attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://botokaw.ru/award?keyword=definition+of+algae+pdf PDF link annotation
    • http://tb-films.ru/misisujijal0u8pk.pdfIn PDF document text
    • http://goxatut.iblogger.org/2004_club_car_precedent_parts_manual.pdfIn PDF document text
    • http://wdd13.ru/les_miserables_cast_2019_masterpiece_theater8evu3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460449/normal_5fd37bff43dc6.pdfIn PDF document text
    • http://bio-ita.fun/sonicwall_tz_205_setup_guideimzrq.pdfIn PDF document text
    • http://maxitis.22web.org/72038137918.pdfIn PDF document text
    • http://somixewavado.sportsontheweb.net/minn_kota_terrova_i_pilot_remote_problems.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459917/normal_604c973fd5abf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sojugixu.epizy.com/angular_6_create_templateref_from_string.pdfIn PDF document text
    • http://kikujebi.epizy.com/28891928488.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cab2866d-e3d1-430f-b969-c964d1b3bbfd/can_you_download_apps_on_an_ipod_touch_4th_generation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2961e0d7-6ff8-42fd-94ab-4b891c772236/how_to_explain_love_in_one_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8763b17d-b14c-4bde-ac1f-2bdcee66ef1a/79134509849.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/babd56c0-05db-4a69-a019-6e1794c8440f/business_communication_chapter_12_quizlet.pdfIn PDF document text
    • http://tixofimisupabev.onlinewebshop.net/sotebejigokegos.pdfIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/megewusidapub.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/22584458189.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/88854528265.pdfIn PDF document text
    • http://dejibokakar.onlinewebshop.net/awareness_of_cervical_cancer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80326e36-ce53-46ca-b2dd-e416ffa44354/how_do_you_flush_a_rheem_tankless_water_heater.pdfIn PDF document text
    • http://giduzorim.epizy.com/cricket_match_highlights_free.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_off0001dfdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DFDF 3232 bytes
SHA-256: f0308fa27e557db449f1db344be257bfd50b1a7208e54c259a73aca750f78d15
font_01_sfnt_off0001eb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EB4C 4936 bytes
SHA-256: 29c2a091a35dc9cfbbf2f3806dd8fc747c019dd8c11eab6d3e4e4abade57f9a0
font_02_sfnt_off0001fc39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FC39 16208 bytes
SHA-256: 841c20bc730c359230a3935715921eef30908beacc55563319095e20ea360ef7
font_03_sfnt_off00022cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22CC6 16112 bytes
SHA-256: 1263f1826cd6430d6608d1c8e19773e4420140138037191ba19d08521e5bc15c