Malicious PDF — malware analysis report

Static analysis result for SHA-256 939459fdf14feb07…

MALICIOUS

PDF

86.5 KB Created: 2021-03-21 06:36:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 68b33878ca125d2fce8887b98c96ed5a SHA-1: b28f7cff7df2e76741d98b44edd6dbc12a344243 SHA-256: 939459fdf14feb07b58a893ea670e6e242ad1eadbe0d5a003cc9117346420e91
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified 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 document body, though truncated, contains metadata related to its creation by wkhtmltopdf, which can be used in exploit chains.

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://jacksth.ru/strik?utm_term=the+rules+book+summary PDF link annotation
    • http://lusolakidareve.mywebcommunity.org/mibelurekufegojasuwul.pdfIn PDF document text
    • http://supariwepexafat.mywebcommunity.org/caballo_de_troya_9.pdfIn PDF document text
    • http://zokidinodajives.getenjoyment.net/descargar_la_biblia_reina_valera_1960_gratis_para_pc.pdfIn PDF document text
    • http://telovajov.medianewsonline.com/rational_choice_theory_criminology.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448744/normal_604b5495dafb8.pdfIn PDF document text
    • http://nifazafagikoxa.medianewsonline.com/jokorivuruma.pdfIn PDF document text
    • https://novatoful.weebly.com/uploads/1/3/0/9/130969934/morovawe_lulipenewe_vogaxedosizazoj.pdfIn PDF document text
    • http://nomevufaneboja.mypressonline.com/98628020436.pdfIn PDF document text
    • http://rasidafepu.mypressonline.com/la_caverna_de_platon_descargar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366347/normal_60322d48dc23e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383321/normal_604b6a7d37be9.pdfIn PDF document text
    • http://majelogajizivo.iblogger.org/wupumuzisopafoporij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476152/normal_5fd2af63a678a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502493/normal_5ff138d63a724.pdfIn PDF document text
    • https://sitegevom.weebly.com/uploads/1/3/4/6/134664280/xusijofefi_nediselesegisup_jelarawadopi_jijomosi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_e793343195aa4edba9a7d2dd98ccd1b8.pdf?index=trueIn PDF document text
    • http://dunudorawexuva.rf.gd/793108471.pdfIn PDF document text
    • https://b6f97e74-198a-461d-a312-d71b9712332b.filesusr.com/ugd/a2d007_61df2ce57145413d8b75aed6c6a65347.pdf?index=trueIn PDF document text
    • https://ef5e9b3f-1a8e-4c79-9b60-34b8f8133c96.filesusr.com/ugd/18574e_6a08c5f5290b4b5c8dcd964d243acda7.pdf?index=trueIn PDF document text
    • https://30372bae-fb3d-4285-bee0-d91e70c22047.filesusr.com/ugd/835091_c855f941b728488783e0e3076ce2f0dc.pdf?index=trueIn PDF document text
    • http://gevejonitu.onlinewebshop.net/59053328749.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_off0001131f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131F 5180 bytes
SHA-256: 65190f16041dedb98a5d79b78ac33bfcbbee09ed65e4d02de7e6f40d682426d9
font_01_sfnt_off00012496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12496 11432 bytes
SHA-256: 306ca7dc0ee4cc41031351c39fddf0c35d8082856220c40639dae3193cebdb46

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