Malicious PDF — malware analysis report

Static analysis result for SHA-256 8da9f363af27f932…

MALICIOUS

PDF

79.4 KB Created: 2021-04-25 00:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 2829da8efa7e63b9e4f8c08209b380e4 SHA-1: a9f76308d938cd8cd3e1148de6f40abb27e942ea SHA-256: 8da9f363af27f93212ad489419703db3326fc997c8ba1e72b8f2b598e98dadc6
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, indicating it functions as a link farm. The primary malicious URLs identified are https://mezovuduw.ru/strik and http://wewogokuwidu.mywebcommunity.org/funcionamiento_de_motor_electrico_de_corriente_continua.pdf, which are likely used to redirect users to phishing sites or download further malware. The document body is heavily obfuscated and unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://mezovuduw.ru/strik?utm_term=what+was+lady+macbeth%2527s+role+in+the+play PDF link annotation
    • http://wewogokuwidu.mywebcommunity.org/funcionamiento_de_motor_electrico_de_corriente_continua.pdfIn PDF document text
    • https://cdn.sqhk.co/nosilaxuziz/hIifpy5/new_callaway_blade_irons_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/tajaketo/JBrgeXn/pozodekafipekezopis.pdfIn PDF document text
    • http://finuxezanasa.mygamesonline.org/aiag_apqp_manual_4th_edition.pdfIn PDF document text
    • https://cdn.sqhk.co/jegamaxegev/jijam6Y/35752017715.pdfIn PDF document text
    • https://cdn.sqhk.co/vakolitakap/chf9hlM/11633347315.pdfIn PDF document text
    • https://cdn.sqhk.co/zawileveruz/dig9ihM/56822699700.pdfIn PDF document text
    • http://difanitukovu.mywebcommunity.org/kroniki_anunnaki_chomikuj.pdfIn PDF document text
    • https://cdn.sqhk.co/litopozuf/gd4FjhJ/937010990.pdfIn PDF document text
    • https://cdn.sqhk.co/netomivoku/gjrLgdV/wild_n_out_hitman_holla_age.pdfIn PDF document text
    • http://bisituz.sportsontheweb.net/97548180396.pdfIn PDF document text
    • https://cdn.sqhk.co/mamevugixej/03QUgiR/snapchat_block_story_not_working.pdfIn PDF document text
    • https://cdn.sqhk.co/posiraki/a7heAia/wimitibudi.pdfIn PDF document text
    • https://cdn.sqhk.co/wugeguxu/gfjfiel/ufc_fight_schedule_free.pdfIn PDF document text
    • http://puvinizozibejir.mygamesonline.org/buenos_habitos_alimenticios_para_nios.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bdee3e82-1fe6-4084-b289-f15f5249f83e.filesusr.com/ugd/749937_63f07a35e1134ea38c560560ba8607ea.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cb93380-5ea2-424a-8cb5-bbe724c5ea6b/braun_thermoscan_exactemp_directions.pdfIn PDF document text
    • https://51da6a7d-ee05-4a49-87ee-1b74af3aeb07.filesusr.com/ugd/b80405_2cb2ca3ab83247419a6e79f10922d2f4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/01f7dc00-c097-4248-a25d-747fe010f8c3/common_core_sheets_finding_equivalent_unit_fraction_with_fractions.pdfIn PDF document text
    • http://zedofaxuboz.onlinewebshop.net/vw_vanagon_workshop_manual.pdfIn PDF document text
    • http://nukivamo.myartsonline.com/borumukanuwon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a99ce96b-7d92-4354-adf8-d0a4b68bdf74/75986137643.pdfIn PDF document text
    • http://rugefar.myartsonline.com/55120048019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d9a9bf3-527e-4584-b3d7-e4998f0edfd4/17867495466.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50e5b042-2780-4758-a16f-a585619e2c20/24440009612.pdfIn PDF document text
    • https://b2f02272-107b-4032-aafc-54cdd6265a16.filesusr.com/ugd/6cf392_e51413eeb385406c9ba74f9b874e83e1.pdf?index=trueIn 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_off0000f3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EA 5692 bytes
SHA-256: 43e1ab07433184352bd53b76bec0179b183782e9465487f74334dccf1f0706ca
font_01_sfnt_off0001073a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073A 11396 bytes
SHA-256: 0d2d6fd110aac8a13d4b3ffd25eaab8190fbc27f5cfaf738aebdd2de84c4b602