Malicious PDF — malware analysis report

Static analysis result for SHA-256 94ef10cbc365d49f…

MALICIOUS

PDF

82.2 KB Created: 2021-02-24 17:46:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 97fefa40548a0f9f9849f85f94c7250a SHA-1: 9edc82b9fa5c44627f4f76c40c2217426a104d4d SHA-256: 94ef10cbc365d49f255d35c3bcc59ca881ce232cf40a95809b03358107f0117c
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, with one prominent URL pointing to 'jacksth.ru', suggesting an attempt to redirect users to a malicious site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is designed to host many links on disposable domains. No scripts were extracted, but the overall structure and URL distribution point to a malicious intent to lead users to external, potentially harmful 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://jacksth.ru/strik?utm_term=the+killing+joke+band PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453326/normal_60184b2bc316c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368770/normal_60243b7b90b75.pdfIn PDF document text
    • http://veruvipavopa.getenjoyment.net/newanipexesokufuginowi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456135/normal_5ff2e83d43193.pdfIn PDF document text
    • https://cdn.sqhk.co/semejegofip/EJhcEgf/bonbon_cakery_mod_2._1._1.pdfIn PDF document text
    • https://cdn.sqhk.co/pufojoloz/jigg4OI/royal_farms_arena_baltimore_maryland_usa.pdfIn PDF document text
    • http://kirakexig.mypressonline.com/dilezazizazowufo.pdfIn PDF document text
    • http://sevagawos.getenjoyment.net/the_colour_of_magic_book_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426677/normal_600407e80a80f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407070/normal_6035eb51c8a43.pdfIn PDF document text
    • http://rexevivejegox.scienceontheweb.net/zimubud.pdfIn PDF document text
    • http://jiwapadenejeza.getenjoyment.net/vuxegutupal.pdfIn PDF document text
    • http://mutujejeturuduf.medianewsonline.com/what_are_the_benefits_of_using_a_hyperbaric_chamber.pdfIn PDF document text
    • https://jakilirimilibev.weebly.com/uploads/1/3/4/8/134862861/c9a0fbf8d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495050/normal_5ffd25474c973.pdfIn PDF document text
    • https://cdn.sqhk.co/nudotunaza/xhhihje/fenevo.pdfIn PDF document text
    • https://kirobobu.weebly.com/uploads/1/3/4/5/134593563/wexaluxet.pdfIn PDF document text
    • http://gakagebir.mypressonline.com/what_is_skin_so_soft_good_for.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zutugidod.onlinewebshop.net/dueos_de_los_medios_de_produccion_del_feudalismo.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_off00010622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10622 5044 bytes
SHA-256: 824c54f35f52bb36654f90537d72edd60129f03d635f82fec2fd5bd60eacf32b
font_01_sfnt_off0001174b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174B 10212 bytes
SHA-256: bc08c33643c7eadfd07837c9753129c6add49937c2dc96ae9a97d0514e7ace98

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