Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb3d3115d683414…

MALICIOUS

PDF

139.0 KB Created: 2021-03-19 23:57:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d556c7155dbffc3b2bd459cac329a47a SHA-1: efa093d4d28445e11db23d9284772486424ce615 SHA-256: cfb3d3115d683414852a7e18627e3247beb31d3db896ffe3af7abe4d3e9047c5
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm or phishing operation. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest the document is designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://gimoguvi.ru/award?keyword=hospital+administration+and+management+a+comprehensive+guide+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4405194/normal_6035045961b6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472774/normal_60494cb1ca45f.pdfIn PDF document text
    • http://urolog.xyz/ariston_aristella_ls_601_manualewnvjf.pdfIn PDF document text
    • http://sufulilutidake.mypressonline.com/guxowe.pdfIn PDF document text
    • http://valuburikodajad.medianewsonline.com/msc_botany_books.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374708/normal_600db2675517f.pdfIn PDF document text
    • http://kemutedetabu.scienceontheweb.net/epidemiologia_teoria_e_prtica_pereira_download_gratis.pdfIn PDF document text
    • http://mitimewigupito.mypressonline.com/37517732463.pdfIn PDF document text
    • http://velesvoyage.ru/zajigisoveraljo3fl.pdfIn PDF document text
    • http://vobajujabu.mywebcommunity.org/39781570291.pdfIn PDF document text
    • http://jafoxidulez.mypressonline.com/craftsman_13.5_hp_riding_lawn_mower_manual.pdfIn PDF document text
    • http://nakalabaxis.mywebcommunity.org/72392620668.pdfIn PDF document text
    • http://powuvomewekuxeb.getenjoyment.net/11294032000.pdfIn PDF document text
    • http://raruranakadup.iblogger.org/astrology_answers_libra_weekly_horoscope.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452595/normal_5fd07f21c77fa.pdfIn PDF document text
    • http://peguxukeziku.sportsontheweb.net/biochemistry_books_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449177/normal_5fec7e73456d2.pdfIn PDF document text
    • http://fukiwurezopukof.mywebcommunity.org/lowufamolikiki.pdfIn PDF document text
    • http://guzexesuge.mypressonline.com/25295992731.pdfIn PDF document text
    • http://allfreebets.ru/lusimudotexb6kp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://bovuzigaratufob.rf.gd/fosabegibexixox.pdfIn PDF document text
    • http://zubiluwetij.myartsonline.com/the_art_of_communication_quotes.pdfIn PDF document text
    • http://xikebivulusures.rf.gd/philips_android_tv_bluetooth_remote.pdfIn PDF document text
    • http://muzulozak.atwebpages.com/jung_memories_dreams_reflections.pdfIn PDF document text
    • http://memezuxel.epizy.com/vox_ac15_manual.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A8C 21872 bytes
SHA-256: 929b847e93e599d7b2935eb0a7c62d7bb5069639bcfe0e116c2e64a49afe6f15
font_01_sfnt_off0001bf25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF25 5472 bytes
SHA-256: e1edfae71f62d4efe7579d5b9a637fc5eb71570942b852933c6e3e991d712d6f
font_02_sfnt_off0001d197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D197 12676 bytes
SHA-256: 3e0f19bf2390c12bd54ff842b10510957f1cde6b246f74365fe07a8e338335bb
font_03_sfnt_off0001fa1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FA1C 16060 bytes
SHA-256: 313c3940a6f4aae92ceaa1b1a843de6e6f13411355a457aba6e018c383fce54c
font_04_sfnt_off00020eb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20EB1 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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