Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd82e9dcf8470c3b…

MALICIOUS

PDF

79.2 KB Created: 2021-03-13 19:15:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98de19141f3c4bde591b747f22e6c8f2 SHA-1: deba87fde48867da829ba6e55c8ef86c8adf28d5 SHA-256: cd82e9dcf8470c3b5974539029c14829be642e7ea0de8325395bb94f62cabf56
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm, and one specific URL is directly associated with a 'monster videos for kids' lure. ClamAV and ML heuristics confirm the malicious nature of the PDF, classifying it as phishing or a Trojan. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/strik?utm_term=monster+videos+for+kids
    • https://cdn-cms.f-static.net/uploads/4370317/normal_60254839e53e4.pdf
    • https://cdn-cms.f-static.net/uploads/4387233/normal_60314b06ed658.pdf
    • https://cdn.sqhk.co/rubutemoxe/cNjN28t/thor_ragnarok_characters.pdf
    • https://cdn.sqhk.co/zarepowake/cUjbLhf/math_1314_college_algebra_answers.pdf
    • http://padapup.iblogger.org/pocket_guide_to_apa_style_6th_edition.pdf
    • https://cdn.sqhk.co/tosilura/6idHg2F/free_tv_shows_and_movies_online_without_downloading.pdf
    • https://cdn-cms.f-static.net/uploads/4376371/normal_6035fa5db210a.pdf
    • https://cdn-cms.f-static.net/uploads/4368949/normal_602509c6a7fcb.pdf
    • https://cdn.sqhk.co/lagusive/ghaaHpQ/ghost_sound_ringtone_download_pagalworld.pdf
    • https://cdn.sqhk.co/jurugaguvedu/ghTLgfS/youtube_leapfrog_studios.pdf
    • https://cdn.sqhk.co/zokosofu/ghj5jgj/her_movie_story_explained.pdf
    • https://cdn.sqhk.co/dedejosewor/etDPZgx/vuninemawigapu.pdf
    • https://cdn-cms.f-static.net/uploads/4459329/normal_60296e994f305.pdf
    • https://static.s123-cdn-static.com/uploads/4470223/normal_60082ac89e57b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://senofigudam.epizy.com/plan_y_programa_de_estudios_2011_secundaria_espaol_primer_grado.pdf
    • http://laganomezavarof.epizy.com/91482248895.pdf
    • https://c6de0af5-2a4c-46da-924c-839bccb102c6.filesusr.com/ugd/5f1f0f_bbbfc6fefdce4615af4f86d47af6c2f6.pdf?index=true
    • http://konevimojo.epizy.com/76835663060.pdf
    • https://6998e30b-c911-4113-ab34-4c15204891c7.filesusr.com/ugd/429b25_d2fbd2d9f3ea4809807be611410d6fc1.pdf?index=true
    • https://f421159b-d329-41e8-bc42-072bc93e4c50.filesusr.com/ugd/65d6f7_4e108588ce0d4176a008a830697c1a58.pdf?index=true
    • http://mabidorozo.rf.gd/how_do_you_play_pairs_card_game_spit.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec3b.bin
33400a3726c487ec07f04e4b5bbb49af6a8714e76c1c44528f6ac0a49c0e36be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3B 4576 bytes
font_01_sfnt_off0000fbdf.bin
b6d7b9e367a0444262faa8a0690ea120055218029f8f74f09c151f3505737696		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDF 11160 bytes
font_02_sfnt_off00012194.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12194 4324 bytes

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