Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a133b44637ee513…

MALICIOUS

PDF

77.7 KB Created: 2021-04-25 13:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 41c0c452f4fe726e51f62ab068d9b1c9 SHA-1: fb925f0a2f6729917a7a0a79dce4d605469d884b SHA-256: 8a133b44637ee51369182f301aaa7f103f2fa5347890ede21ca5727ba5373d0c
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs, one of which is identified as a malicious redirector. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the PDF is part of a link farm on disposable hosting, and the ML classifier and ClamAV detection strongly suggest malicious intent. The primary malicious URL identified is https://botokaw.ru/strik?utm_term=how+to+replace+battery+on+kwikset+door+lock, which is likely used to deliver a secondary payload or redirect to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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/strik?utm_term=how+to+replace+battery+on+kwikset+door+lock
    • https://cdn.sqhk.co/wapogade/r8ig1JK/pocket_league_story_guide.pdf
    • https://cdn.sqhk.co/segisaxa/PjhIS3j/xanotefivotu.pdf
    • https://cdn.sqhk.co/xamowizaso/3gcoJjd/archipelago_terrain_presets_free_download.pdf
    • https://cdn.sqhk.co/nupumusu/jbihfge/luzivufevizofulujivubix.pdf
    • http://xenogejewaruvi.22web.org/the_good_witch_s_guide.pdf
    • http://fetesitomer.mygamesonline.org/66899289331.pdf
    • https://cdn.sqhk.co/jesupasuzoku/Nifjfge/small_story_in_english_for_class_9.pdf
    • http://gakagebir.mypressonline.com/razalisibutapotigu.pdf
    • http://bapipakaroxi.22web.org/juzipi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jonogib.epizy.com/starbucks_delivering_customer_service_harvard_case_study_analysis.pdf
    • http://vevemaj.rf.gd/old_grandma_meme_template.pdf
    • http://gozidonozali.myartsonline.com/85003140722.pdf
    • https://uploads.strikinglycdn.com/files/4231d732-890d-44a4-8ba3-f5e9dc8e7eb8/fojege.pdf
    • http://rewuwuja.onlinewebshop.net/carbon_cycle_download.pdf
    • http://rozasazi.epizy.com/confluence_page_templates_free.pdf
    • https://s3.amazonaws.com/remeranexe/64872281715.pdf
    • https://s3.amazonaws.com/jalasilunaz/bandook_wali_game_video.pdf
    • https://s3.amazonaws.com/wefemabeni/hookah_bar_remix_song_mr_jatt.pdf
    • https://uploads.strikinglycdn.com/files/17823ab3-bb96-438e-a759-d9d64b2c9fd5/pisikoxijorutafipizuru.pdf
    • http://kubivakov.epizy.com/iso_9001_audit_schedule_template.pdf
    • https://s3.amazonaws.com/panalipolifod/investigation_13_enzyme_activity_pre_lab_answers.pdf
    • https://uploads.strikinglycdn.com/files/0fe85aea-8aa1-49ac-aa88-a78c4fbafc31/how_to_set_personal_goals_in_life.pdf
    • https://uploads.strikinglycdn.com/files/6a35b946-4090-4c3e-8533-b18e5c0bbf52/58649200037.pdf
    • http://fuvezijejek.epizy.com/78815553821.pdf
    • http://tofisazo.epizy.com/practical_astro_numerology.pdf
    • https://s3.amazonaws.com/debiwelof/how_to_write_a_short_bio_about_someone_else.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_off0000f279.bin
cf44cefbc1eed2be34dd96b0d8ebba73757f4b3097513643571eac17db6ec8b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF279 5424 bytes
font_01_sfnt_off00010505.bin
20ebe2917901bee834e28217127ecc512633a3ad1630c129bde1af41b683ece5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10505 10592 bytes

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