Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f369f69a7356231…

MALICIOUS

PDF

78.2 KB Created: 2021-04-09 09:06:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c81c9cc02f2d294274f097bc1ce48156 SHA-1: dc74eb43599753d4712930de006c17e3aa5bf5ec SHA-256: 7f369f69a735623190316395cdbd7b3b7dc626583fed267ce6a45d6f68ec776c
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically identified as a lure to a malicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The presence of embedded URLs and the link farm heuristic suggest the document's primary purpose is to redirect users to potentially harmful content.

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://xajibur.ru/strik?utm_term=stevens+320+12+gauge+field+grade+accessories
    • http://prizinsta.online/zoruxagononebijerurukiqa1zh.pdf
    • http://tuderoba.getenjoyment.net/the_stand_2020_official_trailer.pdf
    • http://solent.bar/xawujupudupitopeyhnwz.pdf
    • http://dithetsen.xyz/learn_hindi_in_30_days_through_telugu_book_free_downloadl36oe.pdf
    • http://dmdmassage.com/lasuwugebalebazefz6o64.pdf
    • http://biniwitovo.mywebcommunity.org/roku_3810r_vs_3811r.pdf
    • http://xufelaketodo.getenjoyment.net/alan_watts_out_of_your_mind_download.pdf
    • http://itravelgr.com/1958592740gpb2o.pdf
    • http://midunetojonawiw.mywebcommunity.org/whirlpool_wtw5000dw1_parts.pdf
    • http://mybatut.store/the_escapists_prison_escape_apkpurenz8tr.pdf
    • http://xenejesujotolud.mypressonline.com/ralijadavaberowol.pdf
    • http://vamoktin.ru/godokajixurefofqfksk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://77a5c3e7-429a-4f60-ad30-886abaef4f6e.filesusr.com/ugd/07a1ab_6498182309d6406abaf42ab819ca2a2d.pdf?index=true
    • http://dejibokakar.onlinewebshop.net/antigone_de_jean_anouilh.pdf
    • http://mewexudidis.epizy.com/asbestos_awareness_course_test_answers.pdf
    • http://tiluxusimutine.atwebpages.com/2009_ktm_990_adventure_owners_manual.pdf
    • https://2e5cbe44-7de3-4e3f-b94c-8a8567814465.filesusr.com/ugd/f96b02_77d9f497f4764ebea4907becc8dd10bf.pdf?index=true
    • https://5a8aee2d-3d68-4c09-98ed-743c9c56d6fd.filesusr.com/ugd/460efe_7d7e85dd9ad4459488245c5cc0615fd5.pdf?index=true
    • https://06e27459-8a58-4d01-a48e-f853eab966f6.filesusr.com/ugd/55f1a0_8289ae5d92f944d18a65dd2aff3778e9.pdf?index=true
    • http://rixibedi.onlinewebshop.net/71420751956.pdf
    • http://bajobakokela.epizy.com/general_purpose_financial_statements_template.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef57.bin
58e7e5f035c6e6317b33884258debd8df8291cccb1c5cd36e1e9c3ba3f942ba7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF57 5840 bytes
font_01_sfnt_off00010353.bin
517a4d839e6820b956f256eae83be69dcdbfd0de42dd429415ef3679a5702182		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10353 12168 bytes

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