Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c5fd4fa1800a255…

MALICIOUS

PDF

88.9 KB Created: 2021-03-22 02:42:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0820f92b929f33f783d971544e03a3de SHA-1: e81c86c9a8e929b60de0b59948dd20d184cc4291 SHA-256: 6c5fd4fa1800a2555789879ee4badf690b06921d1cb305d100355483d1f19985
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dafemum.ru/strik?utm_term=marantec+m4500e+won%2527t+close
    • http://zagejudivavi.sportsontheweb.net/amor_y_el_respeto_frases.pdf
    • http://vashobereg.com/kopoz54311.pdf
    • http://topsol.xyz/how_to_put_refill_in_diaper_genie_complete5ak6h.pdf
    • https://cdn.sqhk.co/rapovebakeb/TThcaq7/95344011085.pdf
    • https://cdn.sqhk.co/xagaxubibiz/gfiijdF/xojulaxatupemuvadi.pdf
    • http://axecheat6.xyz/how_to_get_work_as_a_freelance_editoroa3ib.pdf
    • http://sweetmeet.online/manual_del_conductor_2019_gratismad90.pdf
    • http://koparikamoze.scienceontheweb.net/39150701769.pdf
    • http://jidapuxedepu.medianewsonline.com/musasofo.pdf
    • http://ketotreno.buzz/ham_radio_general_test_study_guidewx336.pdf
    • https://cdn.sqhk.co/jomurozop/lZ6dhi3/51193645044.pdf
    • http://jorowijedo.mywebcommunity.org/rapapeluwosunosizorebaj.pdf
    • http://saripituxupagek.sportsontheweb.net/center_of_gravity_and_centroid_solved_problems.pdf
    • http://jabilevij.mypressonline.com/gazutowunonoba.pdf
    • https://cdn.sqhk.co/lepavenujal/Jnoighh/51621572398.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tobikinos.onlinewebshop.net/bivabebexad.pdf
    • http://wijijatalil.epizy.com/mathematics_books_for_class_7.pdf
    • http://dijugotir.epizy.com/batas_pambansa_blg._22_bouncing_check_law.pdf
    • http://donijexufenu.onlinewebshop.net/gejusisin.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_off00011b65.bin
a35637861cb6586fba86e2f21bd75d30cf285971766f5e3103e1caa8680174ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B65 5428 bytes
font_01_sfnt_off00012deb.bin
5f021767b907eb973364a3ee444605c579ff27b882add31a5c844aa9ea2ed0c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DEB 11808 bytes

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