Malicious PDF — malware analysis report

Static analysis result for SHA-256 358570422a82c017…

MALICIOUS

PDF

83.6 KB Created: 2021-04-20 01:30:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6aa7d64d301c0c701dbe35bfa5e5eaf8 SHA-1: 691609708589557b4ca08f2a82bce4d634685647 SHA-256: 358570422a82c0177aaa9307c5f9d4005b71d77834510ab8e76e0dca2ac64d0b
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or suspicious domains, indicating a link farm or phishing 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 phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jumiwimov.ru/strik?utm_term=what+is+the+theme+of+the+first+twilight+book
    • http://teniran.22web.org/gejoxenavojakube.pdf
    • http://trikotoria.ru/3743418727689idj.pdf
    • http://zixivudu.getenjoyment.net/descargar_libro_de_balance_de_materia_y_energia_antonio_valiente.pdf
    • https://rajoligegade.weebly.com/uploads/1/3/4/5/134504333/tuxevuvudonularo.pdf
    • http://blancop.xyz/chicago_manual_of_style_citationm30dp.pdf
    • https://tumugisoluxadez.weebly.com/uploads/1/3/4/6/134601474/fewevozuvijubuf.pdf
    • http://get3creditscores.info/which_samsonite_luggage_is_the_bestj5cde.pdf
    • http://barajofa.mywebcommunity.org/ti-34_multiview_syntax_error.pdf
    • http://thailandlove.site/why_is_my_motorola_turbo_2_not_chargingd02jp.pdf
    • http://vpntop.info/nopinuduvonimuxovexuresaktpotd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bisapovepizaj/debiwi.pdf
    • https://uploads.strikinglycdn.com/files/e071e1da-acb8-483d-8abb-d84a7901bff2/79371188588.pdf
    • http://gedokimisizat.rf.gd/6657883255.pdf
    • http://kepewitibafef.myartsonline.com/racconti_brevi_per_bambini_da_stampare.pdf
    • http://tezadoni.rf.gd/when_does_aphria_report_earnings.pdf
    • https://s3.amazonaws.com/jivagajamav/bosen_bosen_boisa_jan_3gp.pdf
    • https://uploads.strikinglycdn.com/files/f4815ee8-1757-4be4-8a79-136ede91be52/organizational_behavior_18th_edition_robbins_and_judge.pdf
    • https://uploads.strikinglycdn.com/files/b7b9e431-9025-48c7-8894-e801652b4957/lee_child_jack_reacher_books_in_chronological_order.pdf
    • https://uploads.strikinglycdn.com/files/4fbaf48a-74f9-449d-a5d2-c236d9fa42e3/92704653432.pdf
    • http://xonisuxumezitez.epizy.com/40197338279.pdf
    • http://vawanumezal.onlinewebshop.net/jikaliguvutosoviraxifob.pdf
    • https://uploads.strikinglycdn.com/files/c906f8d8-a414-49ec-8d5c-2f899bb885d3/21134721758.pdf
    • https://s3.amazonaws.com/bupijila/lolebewaxab.pdf
    • https://s3.amazonaws.com/jazofi/attarintiki_daredi_video_songs_free.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_off000108fd.bin
1c2ba0ed5e1346194e5b827e26e799b83abb163425686ac74c5090f108e79be8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108FD 5488 bytes
font_01_sfnt_off00011b9d.bin
e97d39b0649432d46d91bac6ee4ef59250640b4cf03a86687b90bd2a5ed51096		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9D 10796 bytes

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