Malicious PDF — malware analysis report

Static analysis result for SHA-256 73251a49897b724a…

MALICIOUS

PDF

130.8 KB Created: 2021-04-02 07:22:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 16d27450ac932a3730769f831217c121 SHA-1: 9e08e7a39b329da9c92f50da9a2411480663ae42 SHA-256: 73251a49897b724a02855cb23b9137481e8e6d657e90a27d3f71a2be6875e5f5
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, a common tactic for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, pointing to a deliberate attempt to obscure malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • 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 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://jacksth.ru/strik?utm_term=what+is+integration+in+maths+in+urdu PDF link annotation
    • http://fidofawi.medianewsonline.com/hp_laserjet_pro_400_mfp_m425dn_driver_xp.pdfIn PDF document text
    • http://mamuxorap.getenjoyment.net/23525638257.pdfIn PDF document text
    • https://cdn.sqhk.co/sojetaji/WEhbkSm/jio_keypad_mobile_se_recharge_kaise_kare.pdfIn PDF document text
    • http://jovasetiveduza.scienceontheweb.net/fevizexaxijupadivu.pdfIn PDF document text
    • http://zinabexodepo.iblogger.org/godajikekikiso.pdfIn PDF document text
    • https://cdn.sqhk.co/jizapamilizo/idnWijV/menu_domino_s_pizza_2020.pdfIn PDF document text
    • http://mejuzuw.scienceontheweb.net/filehippo_to_jpg_converter.pdfIn PDF document text
    • https://cdn.sqhk.co/budotedo/sMeBmia/43442327896.pdfIn PDF document text
    • https://cdn.sqhk.co/momujolo/QQniagc/parallel_space_64_bit_support_stopped_working.pdfIn PDF document text
    • https://cdn.sqhk.co/jimumakevaji/1gdhhie/polandball_not_safe_for_world_mod_apk.pdfIn PDF document text
    • http://tekupugu.sportsontheweb.net/53552474898.pdfIn PDF document text
    • http://libuwapuvewipev.mywebcommunity.org/57054418033.pdfIn PDF document text
    • http://puzexijabin.mypressonline.com/93014655053.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/PibLjcP/clothes_worksheets_clipart.pdfIn PDF document text
    • http://davupopebuwiser.sportsontheweb.net/ruzefekemusipok.pdfIn PDF document text
    • https://cdn.sqhk.co/kewukapugino/1Xghjly/wwe_champions_top_tier_list_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pugetuwozijeso.rf.gd/2311967363.pdfIn PDF document text
    • http://sawokemapixaf.epizy.com/wovogatapipur.pdfIn PDF document text
    • http://xexobazetozi.epizy.com/52884820966.pdfIn PDF document text
    • http://jojofolarimema.epizy.com/app_store_android_play_store.pdfIn PDF document text
    • http://jiruroxi.epizy.com/nukokajov.pdfIn PDF document text
    • http://vinegufoxa.rf.gd/ipod_nano_3rd_generation_4gb_user_guide.pdfIn PDF document text
    • http://wifukuvupuluxu.epizy.com/what_is_the_directv_code_for_element_tv.pdfIn PDF document text
    • http://bosotosevizava.rf.gd/30913815106.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001aaa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AAA7 5220 bytes
SHA-256: 483391ad30605824a60be093d6ba01d9959ef1e3ae9b22e8d28970364d23cb97
font_01_sfnt_off0001bc46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC46 13220 bytes
SHA-256: 4792ad8cfdcafffb792c35826d0d3e3a50c70c7ebcf89e3abba75691f510ad17
font_02_sfnt_off0001e74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E74E 16112 bytes
SHA-256: 304b01acf1c70644712d7cb6faef85aa6aa8fd1811786552c8c79b53818ac44b

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