Malicious PDF — malware analysis report

Static analysis result for SHA-256 41a3ad48ffda91c1…

MALICIOUS

PDF

76.4 KB Created: 2021-03-03 02:17:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 17a4518b8501c71d072789996579cc0b SHA-1: 1f3f3afdfd98a4e29ebdce2158085075bb5f82f5 SHA-256: 41a3ad48ffda91c1f887607335cb34f090e2669fa9a68417b21e43813187ccc1
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://nipisod.ru/strik?utm_term=average+material+science+engineer+salary PDF link annotation
    • https://cdn.sqhk.co/kajipazuto/ajiY6LB/monument_valley_game_art_prints.pdfIn PDF document text
    • http://geosen.net/9751515986ef6nv.pdfIn PDF document text
    • https://cdn.sqhk.co/felatadag/qhihceI/wuwijo.pdfIn PDF document text
    • http://nesorus.mywebcommunity.org/7000309589.pdfIn PDF document text
    • http://fexevewuli.mypressonline.com/nintendo_switch_video_games_2021.pdfIn PDF document text
    • https://cdn.sqhk.co/vimewiki/hMeZgB6/wabofewujosifujimuw.pdfIn PDF document text
    • http://mumolazesinidix.getenjoyment.net/how_to_write_a_rental_agreement_for_a_roommate.pdfIn PDF document text
    • http://kiwenalod.medianewsonline.com/my_harbor_breeze_ceiling_fan_stopped_working.pdfIn PDF document text
    • http://itawegan.space/vorexolosisojorokidue408.pdfIn PDF document text
    • http://vanimerukaguto.scienceontheweb.net/how_to_return_online_orders_old_navy.pdfIn PDF document text
    • https://cdn.sqhk.co/niripakexad/idn5ije/bataille_de_la_marne_1914_youtube.pdfIn PDF document text
    • http://fazejajogavu.medianewsonline.com/9873629802.pdfIn PDF document text
    • http://mrt-zdes.ru/82231116588xg8k4.pdfIn PDF document text
    • https://cdn.sqhk.co/nuponoviva/xFifQtg/rotten_teeth_falling_out_dream.pdfIn PDF document text
    • http://vofufime.mypressonline.com/17219847110.pdfIn PDF document text
    • http://vuzetasavuxoso.mygamesonline.org/argumentative_writing_outline_middle_school.pdfIn PDF document text
    • https://cdn.sqhk.co/pasededi/hAOjhUc/road_trip_printables_for_preschoolers.pdfIn PDF document text
    • https://cdn.sqhk.co/dajebala/hed0giN/samsung_note_9_secure_folder_missing.pdfIn PDF document text
    • http://wiwajekirutiw.scienceontheweb.net/91518897322.pdfIn PDF document text
    • http://qwertyujg.xyz/academy_stars_3_pupil_s_book5a722.pdfIn PDF document text
    • https://cdn.sqhk.co/rukokota/gidijhd/9363751584.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kuwijiti.myartsonline.com/bopafuwokatozi.pdfIn PDF document text
    • http://bekusisit.atwebpages.com/how_to_write_a_presentation_speech.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_off0000ec78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC78 5268 bytes
SHA-256: 13a1a50de32281ea1b65477fd8fd2658ba6887ef9de34070d4c0fc7bb9383dce
font_01_sfnt_off0000fe60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE60 10964 bytes
SHA-256: cc5219d920bc2982f38f3d98bc747d2f830b11ad2b1fb80c3119477b0a6388ba

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