Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc6079e9843f9a74…

MALICIOUS

PDF

68.3 KB Created: 2021-03-26 10:23:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 840fda1f23ca9f2f2f6dc845abf8dc67 SHA-1: bd5e9888644627916c77ba63386aef9cf6e1c500 SHA-256: cc6079e9843f9a74051cf86151f32d4f70599dcf1bcc429f88dae8c78b3ad0ad
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 external links, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The embedded URL `https://resalured.ru/award?keyword=drugs+in+anaesthesia+and+intensive+care+pdf+free+download` suggests a lure for downloading a medical textbook, which is a common phishing tactic. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to redirect users to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/award?keyword=drugs+in+anaesthesia+and+intensive+care+pdf+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475216/normal_60377d87a8cb4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426974/normal_5fee399e3c1fa.pdfIn PDF document text
    • http://lulopoboxefon.scienceontheweb.net/91021894426.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404490/normal_6016d52e0ac84.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383800/normal_5fc681f13f04a.pdfIn PDF document text
    • http://wanididezaj.getenjoyment.net/pidinaket.pdfIn PDF document text
    • http://bekopomulasebi.getenjoyment.net/algebra_and_trigonometry_10th_edition_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421215/normal_6031f6756f2c3.pdfIn PDF document text
    • http://dadivasim.sportsontheweb.net/30050929169.pdfIn PDF document text
    • http://tonojodozif.mypressonline.com/jinesapakoloxujonafe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408983/normal_60002e9b35091.pdfIn PDF document text
    • http://dapujabowigu.sportsontheweb.net/sat_practice_test_2_college_board.pdfIn PDF document text
    • http://pesuloduf.medianewsonline.com/ap_stylebook_2020_download.pdfIn PDF document text
    • http://dirozigumifew.scienceontheweb.net/zisutunaribasupofopivo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mulexotuvatago.epizy.com/email_format_english_cbse.pdfIn PDF document text
    • http://gozudivigel.epizy.com/95924958256.pdfIn PDF document text
    • http://lijulipewagikev.rf.gd/filmywap_2019_hollywood_bollywood_movies.pdfIn PDF document text
    • http://tisiwiruligeg.epizy.com/70276508035.pdfIn PDF document text
    • http://sogivuwe.onlinewebshop.net/42882783811.pdfIn PDF document text
    • http://sutabofuvizeja.epizy.com/what_is_a_client_service_associate_at_morgan_stanley.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_off0000cb48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB48 5568 bytes
SHA-256: decd92fcd8d1ecc9072bc6419def41d243dd424bdf12449fa824ed3175702344
font_01_sfnt_off0000de55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE55 10892 bytes
SHA-256: 5969368ac156921a17d89488b1f5804ff509d2f262e5dff626cf107cd44a522c

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