Malicious PDF — malware analysis report

Static analysis result for SHA-256 188fca77ef21ef98…

MALICIOUS

PDF

103.4 KB Created: 2021-03-23 08:12:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 0160dd06d71958413c9999ede6796a44 SHA-1: 0fa6cd8f2bb8663c7a82c74b7c62febc743011bd SHA-256: 188fca77ef21ef98b19ed95ee1d0940176d921e8213cff76497a1d476033594d
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent external URI pointing to 'jumiwimov.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a structure designed to host many links on disposable domains, suggesting a malicious intent to redirect users. No scripts were extracted, but the overall structure and URL analysis point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jumiwimov.ru/wix?keyword=omron+e5cn+instructions PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368506/normal_5fe298a920c02.pdfIn PDF document text
    • https://cdn.sqhk.co/bataseset/bPwNuhd/xaluwafetebuxizago.pdfIn PDF document text
    • https://cdn.sqhk.co/xalesikozip/ShjnPqr/pubg_gun_shot_sound_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375071/normal_6054d2e1deeaa.pdfIn PDF document text
    • http://midunetojonawiw.mywebcommunity.org/what_food_should_i_eat_with_ibs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458633/normal_6052fdb10ccd4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393755/normal_5fc5a0e321259.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420441/normal_5fc86e78605e6.pdfIn PDF document text
    • https://cdn.sqhk.co/vamaxojurapu/ghheNia/bamakozexuravivix.pdfIn PDF document text
    • https://jipoditilab.weebly.com/uploads/1/3/1/4/131407274/livemumutitinuk.pdfIn PDF document text
    • https://cdn.sqhk.co/pivugituxi/gQdlTRZ/mitufuguzunosowuseso.pdfIn PDF document text
    • https://niritopep.weebly.com/uploads/1/3/4/6/134634222/53ea6035cbd07ec.pdfIn PDF document text
    • http://xawowonulop.22web.org/company_logos_and_taglines_quiz.pdfIn PDF document text
    • https://cdn.sqhk.co/zuronenom/iajicKr/best_50_inch_120hz_tv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470979/normal_604a7b539a67b.pdfIn PDF document text
    • http://sotatetivula.iblogger.org/xejetimitagalab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372985/normal_6041e92e47ed6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xuvuzonixo.onlinewebshop.net/anne_of_green_gables_abridged_version.pdfIn PDF document text
    • http://mutifesojare.epizy.com/reduce_file_size_mac_keep_quality.pdfIn PDF document text
    • http://tiwumuni.epizy.com/larofofozavirizomex.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1B 2960 bytes
SHA-256: 3a99bfcc8a6322cb1f5d9dd0c76c95525b0630114fc12c53a342d41e6b6e0e01
font_01_sfnt_off0001348b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1348B 4736 bytes
SHA-256: 78739a58379b23b196b71bce969a9440136f18cf761a98ed9e8d7b151830ade5
font_02_sfnt_off00014487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14487 5072 bytes
SHA-256: edc4cd8e85baa8069c045f6c9ddb83bed1e83275a77db27f8150f85dcc005546
font_03_sfnt_off00015813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15813 12176 bytes
SHA-256: 70bbcdb175438f26be23dceb7bb76b048ebc36b0afeb2ec854600a4987b11a65
font_04_sfnt_off00018159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18159 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2