Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3f7fb4269975a4e…

MALICIOUS

PDF

92.1 KB Created: 2021-04-19 06:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 97ee6a8fe4aa2410ba324629697587ad SHA-1: 991e170abbd3dd17c4f72063fec3f2cc19f0b70b SHA-256: f3f7fb4269975a4ef09f6f9dc49406bde802bea7eb6beb5dbf839146128795e2
134 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain associated with a printer cartridge lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?utm_term=hp+officejet+h470+align+print+cartridges
    • https://cdn-cms.f-static.net/uploads/4376380/normal_60264cc7dccd1.pdf
    • https://cdn.sqhk.co/zekafomaze/gcfkeii/bad_north_jotunn_edition_fatigue.pdf
    • http://vaxozudobe.22web.org/kenmore_80_series_washer_timer_repair.pdf
    • http://bilabugova.iblogger.org/basic_elements_of_computer_system.pdf
    • https://cdn.sqhk.co/wuravegaw/oGvjjCy/87239563687.pdf
    • https://cdn.sqhk.co/wisewuguv/8tnVXhf/figuzomubunabobapirijaru.pdf
    • http://tafakiduwav.scienceontheweb.net/limitations_of_1st_law_of_thermodynamics.pdf
    • https://cdn.sqhk.co/jumifokujuje/7ihdhhL/archery_repair_shop_near_me.pdf
    • https://cdn-cms.f-static.net/uploads/4443814/normal_600e389d0f74d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fejakixoweka/kixelixupa.pdf
    • http://pojoviraxerojo.myartsonline.com/lawovagalokemizanur.pdf
    • http://jasigobup.epizy.com/trane_reviews_complaints.pdf
    • https://uploads.strikinglycdn.com/files/9f1948b4-e513-4a26-bd3f-00e1f9bcbb9a/fogipavobazawoxa.pdf
    • https://s3.amazonaws.com/pobixedele/bogitora_zubeen_song.pdf
    • https://uploads.strikinglycdn.com/files/f1ac3b80-4fe3-4d33-bdf2-07523099ec87/boduwi.pdf
    • http://xaminelabiz.epizy.com/sarafajawewesiwafi.pdf
    • https://s3.amazonaws.com/zesotat/will_fifty_shades_darker_be_back_on_netflix.pdf
    • https://uploads.strikinglycdn.com/files/e18e7134-17a9-449f-8006-edaf3105f35d/50553792097.pdf
    • https://s3.amazonaws.com/mafavuzenoliki/33050559320.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_off000126d4.bin
916850ed72c9278bcde1fe40df9eca0b28b36f1e754ddb7f3a3ef7b858cc599f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126D4 5764 bytes
font_01_sfnt_off00013a88.bin
2cd4bcabacd20689877a6515fce15f325eaca8e3fd2d55672400cef7a783cd8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A88 12108 bytes

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