Malicious PDF — malware analysis report

Static analysis result for SHA-256 74f4a763990598a0…

MALICIOUS

PDF

83.4 KB Created: 2021-03-29 20:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 26d5d9a6cf775fef5ae42b4acb42c7dc SHA-1: 1edfb65f6e8816c19eccc80aac30fc9f863aa4a8 SHA-256: 74f4a763990598a0097f6e502faecf09c1934b76f7985d3f33e25e4cebf8e8bb
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and embedded URLs indicate an attempt to disguise malicious activity as legitimate content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/strik?utm_term=financial+modelling+case+study+pdf PDF link annotation
    • http://dimusenomi.iblogger.org/bayesian_belief_network.pdfIn PDF document text
    • http://refoxipixob.iblogger.org/callista_roy_adaptation_theory.pdfIn PDF document text
    • https://cdn.sqhk.co/bidogefapo/halnTja/ximema.pdfIn PDF document text
    • https://xarefiliji.weebly.com/uploads/1/3/4/7/134735925/pijeximava_zivunulo_kupawu_pedidasuxog.pdfIn PDF document text
    • https://cdn.sqhk.co/soletibedix/H6iahbm/final_fantasy_brave_exvius_summon_guide.pdfIn PDF document text
    • http://eyebrowthreadingdallastx.com/supreme_duelist_stickman6qnev.pdfIn PDF document text
    • https://kiwaposuxixu.weebly.com/uploads/1/3/5/3/135329520/19634f.pdfIn PDF document text
    • http://idealicaitalia-official.site/numberformat_format_java_example8a4v8.pdfIn PDF document text
    • http://goodxday.xyz/cd_format_windows_7ghah0.pdfIn PDF document text
    • http://iglivesupportteam.com/tractor_v_phoenix_livey5ici.pdfIn PDF document text
    • http://radanews.site/kung_fu_training_exercisejod1p.pdfIn PDF document text
    • https://cdn.sqhk.co/xugiwatokax/gdgTiiF/xijagumevubodaxoxo.pdfIn PDF document text
    • http://segilajobugulof.iblogger.org/bodybuilding_nutrition_books.pdfIn PDF document text
    • http://wuxudesif.22web.org/46979485683.pdfIn PDF document text
    • https://cdn.sqhk.co/govazilose/ejdErgi/zuwokagojodoxuxeligab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zosajaxuv.epizy.com/xewigolo.pdfIn PDF document text
    • http://zifiwetoma.epizy.com/kagugariwubibeje.pdfIn PDF document text
    • http://nonavijewiw.epizy.com/lean_canvas_template_word_document_download.pdfIn PDF document text
    • http://pofikasuvemili.epizy.com/42383306752.pdfIn PDF document text
    • http://mopepuveg.epizy.com/47951649745.pdfIn PDF document text
    • http://xefoxiwuwoxoja.rf.gd/population_du_cameroun_en_2020.pdfIn PDF document text
    • http://fakuzilezozo.epizy.com/74211137924.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_off00010594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10594 5436 bytes
SHA-256: cefef44deea58262d51ff5cc1e9d3cf5a14aba61c1cea07cd84a5f1a40f5ada0
font_01_sfnt_off00011811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11811 12328 bytes
SHA-256: 77924d6fce1aff0b188d20662cb6232a139bdcbe9cf191854919980bd5c081c7

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