Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bce786d6b10d41b…

MALICIOUS

PDF

95.8 KB Created: 2021-04-30 17:58:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 03900781939e6245d38f3b133ed1748a SHA-1: 20325de488a6ef542a7d3a17eb02acfb472f5ed5 SHA-256: 6bce786d6b10d41bf7283372dabd3ae3b81c8fe3fd2f5e79c899fe8811231259
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged as a link farm. The primary URL, https://midufefew.ru/strik, is likely used to redirect the user to a malicious site for phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/strik?utm_term=argumentative+essay+examples+for+high+school+short PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4406775/normal_606e0b70904af.pdfIn PDF document text
    • http://pufivuziviv.mypressonline.com/fiduzujoxeriw.pdfIn PDF document text
    • http://jujavekerubeko.scienceontheweb.net/pudakiwozubefozulezaso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449205/normal_5ff4e024261c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376601/normal_60433bc751e91.pdfIn PDF document text
    • http://fimewovoko.getenjoyment.net/vapedekamavuvaviwukosune.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4528876/normal_5ff542ac420f7.pdfIn PDF document text
    • http://pixidilivutep.medianewsonline.com/samsung_bd-p1590_blu-ray_player_remote.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465274/normal_5ff7c7bae2d8d.pdfIn PDF document text
    • http://pagujubemozakev.22web.org/administrao_financeira_brigham.pdfIn PDF document text
    • http://vizenam.medianewsonline.com/22363294257.pdfIn PDF document text
    • http://gamowenugeg.sportsontheweb.net/17826536217.pdfIn PDF document text
    • http://mujabelor.mywebcommunity.org/cadena_de_valor_concepto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465704/normal_60328994a2237.pdfIn PDF document text
    • http://xutefizil.getenjoyment.net/52653297717.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454677/normal_5fd30623d491e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422884/normal_5ffe7a7c97873.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://novinijazop.epizy.com/comparative_and_superlative_adverbs.pdfIn PDF document text
    • http://rijemow.onlinewebshop.net/todesetexo.pdfIn PDF document text
    • http://baroputufusu.rf.gd/ximanuka.pdfIn PDF document text
    • http://litopuputorer.rf.gd/jasamivamazawafupanov.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_off000135b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B1 5648 bytes
SHA-256: 97660ce68499f49ef7b1401ef3aceee8fa60ab4c1d3987622680e4e65b5a8ab2
font_01_sfnt_off000148d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148D2 11668 bytes
SHA-256: 9e57f45e11336872e35a05c852c718820f985faa17176a2b47bd2e96597913cc

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