Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cbaf17d9d1a6fd1…

MALICIOUS

PDF

71.3 KB Created: 2021-04-03 19:55:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 622d6927d195a05ebb7dd244683f305a SHA-1: ad05596d582f1221cb58694a1b015cdf5f5218b0 SHA-256: 4cbaf17d9d1a6fd16bf98459f0cc4e57da3e9afb1f11928d84e4ccb3b6e4323f
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with a primary one pointing to 'mezovovuduw.ru/award', suggesting a phishing or malware distribution lure. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, but no clear textual instructions. The presence of multiple disposable hosting links further supports a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://mezovuduw.ru/award?keyword=activator+basic+scan+protocol+pdf PDF link annotation
    • https://julavatevimire.weebly.com/uploads/1/3/4/6/134669339/lorobadobifawe.pdfIn PDF document text
    • https://lijowuvum.weebly.com/uploads/1/3/4/6/134624244/zetijesek_pilumilodox_jamafoder_befaginelunuvi.pdfIn PDF document text
    • http://vavexefane.mypressonline.com/81079329795.pdfIn PDF document text
    • http://sofefowu.iblogger.org/46844177116.pdfIn PDF document text
    • https://cdn.sqhk.co/bijilixiger/Jiijcid/liverpool_wallpaper_2020_pc.pdfIn PDF document text
    • https://zawasofolebu.weebly.com/uploads/1/3/4/9/134902788/2605847.pdfIn PDF document text
    • http://janafan.scienceontheweb.net/raven_botanica_gratis.pdfIn PDF document text
    • http://xafopawiki.medianewsonline.com/way_back_into_love_partitura_piano.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501214/normal_603d30f442195.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379837/normal_60489331a6bc0.pdfIn PDF document text
    • https://dukowitemodilel.weebly.com/uploads/1/3/5/3/135316140/0b5611900bfaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419410/normal_5fe81b5602c1d.pdfIn PDF document text
    • https://cdn.sqhk.co/xedogigiloli/jhtjbjg/bimalodogo.pdfIn PDF document text
    • https://cdn.sqhk.co/gesafafo/hevhiew/flow_diagram_template_powerpoint.pdfIn PDF document text
    • https://cdn.sqhk.co/pejinijew/nrqhhe6/25654184948.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470677/normal_6030519ade75e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503692/normal_5ff709dc79393.pdfIn PDF document text
    • https://cdn.sqhk.co/lewenowaxer/Al8Yghc/razas_de_perros_peludos_chinos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rajusesozawan.rf.gd/emotional_intelligence_and_leadership_development.pdfIn PDF document text
    • https://083189c9-8220-4687-a375-57be19a37228.filesusr.com/ugd/909b15_06a75eb5b4114dfea42567f5f6ecc624.pdf?index=trueIn PDF document text
    • https://12a3aa02-022d-4218-8efb-90aa4388683d.filesusr.com/ugd/6dfd9b_d7c9aec5675f458fb242966b6d3203cc.pdf?index=trueIn PDF document text
    • http://pizoxuwa.epizy.com/endeavour_tv_series_4_episode_guide.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_off0000d954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD954 5340 bytes
SHA-256: 74dee7ffcf7c679402be3785421e98b1e6d4bed12483fcbacbf35df6da234017
font_01_sfnt_off0000eb91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB91 10716 bytes
SHA-256: 10d6fecc7b53c32e97535cde58c63582ba3da344881bfc98befea9323335fc3e

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