Malicious PDF — malware analysis report

Static analysis result for SHA-256 7537bc1c3dab2af0…

MALICIOUS

PDF

81.2 KB Created: 2021-03-18 13:10:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 4a8dec128960415639b40ce2ef90a3fb SHA-1: b0954557e2aa594a47a8076ba89895a52e24c065 SHA-256: 7537bc1c3dab2af0e1a460f3f5097cbde08122c254d0dbf7bb1ce1d64a5a59c3
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs strongly suggest an attempt to facilitate malicious redirects, likely for phishing or malware delivery.

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://kuzutuzo.ru/wix?keyword=two+friends+by+guy+de+maupassant+pdf PDF link annotation
    • https://cdn.sqhk.co/fagaluwozez/jjgjjhb/46642082302.pdfIn PDF document text
    • https://nagudunegotup.weebly.com/uploads/1/3/2/6/132681409/490671.pdfIn PDF document text
    • http://voxofixixaj.iblogger.org/simmba_aankh_maare_video_song_pagalworld.pdfIn PDF document text
    • https://nabidojanafo.weebly.com/uploads/1/3/4/4/134455463/3146449.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428039/normal_5ff3f0e763a61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405186/normal_5fd1efd968e3c.pdfIn PDF document text
    • http://ponexikid.22web.org/nujogagopusabutuk.pdfIn PDF document text
    • https://cdn.sqhk.co/wemopizajazo/ghihehc/lannister_house_words.pdfIn PDF document text
    • http://uggi-ugg.com/wisapogefabafizotitqqd1.pdfIn PDF document text
    • https://cdn.sqhk.co/dunokufimove/i6o5qhg/arya_movie_naa_songs_com.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468289/normal_5fe5091ad445c.pdfIn PDF document text
    • http://sovolox.getenjoyment.net/xadikupokijesoriraxuza.pdfIn PDF document text
    • http://mivamoxejepije.iblogger.org/56868623859.pdfIn PDF document text
    • http://xtreme-sport.ru/husqvarna_st42e_snow_thrower_attachment_with_electric_lift_42-inchti7fz.pdfIn PDF document text
    • https://cdn.sqhk.co/tatogevi/8ricapj/204159109.pdfIn PDF document text
    • http://giwudogor.scienceontheweb.net/86765653520.pdfIn PDF document text
    • https://cdn.sqhk.co/zetuzire/d81vzAR/vintage_space_jam_jacket.pdfIn PDF document text
    • https://gosasolana.weebly.com/uploads/1/3/4/5/134523876/fukez.pdfIn PDF document text
    • http://cesaregaspari.com/ruremuduk49bkn.pdfIn PDF document text
    • https://tesegape.weebly.com/uploads/1/3/5/3/135387632/1479278.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369143/normal_5fdf7edc1c9f4.pdfIn PDF document text
    • https://fajubixinusejeg.weebly.com/uploads/1/3/4/8/134850070/kidojubawisoguwepi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kemuvatixas.epizy.com/how_to_remove_gridlines_in_excel_spreadsheet.pdfIn PDF document text
    • http://forojiwimudobo.atwebpages.com/depoger.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_off000100e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E5 5612 bytes
SHA-256: 366834f3cac196ba03c778cb4538bd82a9aa9388cc23a6ee0b2bfa32204bfb1e
font_01_sfnt_off000113fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FD 10316 bytes
SHA-256: 765f67bf8bc5def799129f26ad153b58bc4bbde8305466fe88f2ea191e54780b

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