Malicious PDF — malware analysis report

Static analysis result for SHA-256 664bd3efe3a9732e…

MALICIOUS

PDF

79.1 KB Created: 2021-03-28 02:21:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 6b69fb826a806420ed7e522660265240 SHA-1: 38f680657bab64b762e4be1d577af7c8d8f8e4fa SHA-256: 664bd3efe3a9732ebc45921d38af9a89f0d013e8fa889a294f4d6daf2fc7ffd3
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting an attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the nature of these links, indicating a low-quality, potentially malicious infrastructure.

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://resalured.ru/wix?keyword=non+manual+signs+asl PDF link annotation
    • https://relabibede.weebly.com/uploads/1/3/2/8/132816075/sunomifuzojun_zirinuxigo_nofusopuxeditum.pdfIn PDF document text
    • https://belogukuke.weebly.com/uploads/1/3/1/6/131637095/a7079e3ff5.pdfIn PDF document text
    • http://sulogajifuv.iblogger.org/best_brand_guidelines_2020.pdfIn PDF document text
    • http://vuzeliligovitu.iblogger.org/parking_slip_template.pdfIn PDF document text
    • https://cdn.sqhk.co/lejesapazud/jKheohb/just_between_us_book_ending.pdfIn PDF document text
    • https://fulidozemupure.weebly.com/uploads/1/3/1/3/131384797/8506384.pdfIn PDF document text
    • http://lufijep.iblogger.org/62583543592.pdfIn PDF document text
    • https://nilezejexi.weebly.com/uploads/1/3/4/7/134737846/5e0a022b4863a.pdfIn PDF document text
    • https://munujagafunudo.weebly.com/uploads/1/3/0/8/130873736/rapulukora.pdfIn PDF document text
    • https://cdn.sqhk.co/zuzudumijamo/OyWXias/pulojafo.pdfIn PDF document text
    • http://xuroriwonufuz.scienceontheweb.net/cells_at_work_manga_download.pdfIn PDF document text
    • http://jidevutijosu.iblogger.org/gym_workout_plan_for_weight_loss_for_mens.pdfIn PDF document text
    • https://badetujunomut.weebly.com/uploads/1/3/1/8/131857650/jarujoxavolob_nimudapozusogav_wirupo_zegado.pdfIn PDF document text
    • http://zikuwojanubeg.iblogger.org/hallelujah_christmas_song_sheet_music.pdfIn PDF document text
    • http://xuzobinemipivor.mygamesonline.org/987601149.pdfIn PDF document text
    • https://giduwuxudi.weebly.com/uploads/1/3/4/7/134716719/3618605.pdfIn PDF document text
    • https://cdn.sqhk.co/xorazasuno/JjeZgih/98708734754.pdfIn PDF document text
    • http://gomesuzos.mypressonline.com/najodofugimek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vifidumefitur.atwebpages.com/88138997019.pdfIn PDF document text
    • http://luxotenudiwuzu.rf.gd/kixapedoxo.pdfIn PDF document text
    • http://fudedeki.rf.gd/related_studies_about_church_information_system.pdfIn PDF document text
    • http://lowexulakapugid.epizy.com/gasenunixixamejatanemer.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_off0000f804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF804 4876 bytes
SHA-256: 1791183108c4a7b855a0bb6e27099013ec1f15a3c07b3674e4fe241800425596
font_01_sfnt_off0001088c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088C 11380 bytes
SHA-256: 25ad3884ca6e67ce65b6ec222d02eaa3963b8853e9aa9edf1c8bb331fdba68f4

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