Malicious PDF — malware analysis report

Static analysis result for SHA-256 96404120b07f9e37…

MALICIOUS

PDF

75.7 KB Created: 2021-03-26 09:47:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4946166f354409c762314f85901cd8c1 SHA-1: d1ca9ca6ffcddbe4c924aa723a24d3111b1ab852 SHA-256: 96404120b07f9e37dd9be7d11245c20491e2aea2e8b5d51dabf42365e96b0804
156 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which are SEO-themed and point to potentially malicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/award?keyword=budget+constraint+economics+pdf
    • http://firstreadersclub.com/types_of_chemical_bonds_worksheet_answers_cacl2g62p9.pdf
    • https://rezalebivug.weebly.com/uploads/1/3/0/9/130969918/2c188.pdf
    • http://cmbclientes.com/the_golfing_machine_3_imperativessgwjn.pdf
    • https://baduzewikabure.weebly.com/uploads/1/3/4/3/134317938/pizamazogosuwanopow.pdf
    • https://fagezatev.weebly.com/uploads/1/3/4/7/134711774/tozomapob.pdf
    • https://pujapuvefebawu.weebly.com/uploads/1/3/4/5/134581836/02c3258bee8b2bd.pdf
    • http://solent.bar/5008271055wc838.pdf
    • https://ladujeka.weebly.com/uploads/1/3/0/9/130969399/df4e4c2b482d74.pdf
    • https://vejazejama.weebly.com/uploads/1/3/1/3/131381369/kuwapuvurisaku.pdf
    • https://wopokajam.weebly.com/uploads/1/3/0/8/130874492/1b20de.pdf
    • https://somirurawepaf.weebly.com/uploads/1/3/1/3/131381963/tebiro.pdf
    • http://bestsaleshopin.xyz/82002964950nppt8.pdf
    • https://ledegukumimajem.weebly.com/uploads/1/3/5/3/135393042/2054409.pdf
    • http://kiwufaninini.22web.org/sefovawemamukam.pdf
    • http://boothattendant.com/kagapipigekeremaiopq1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f4ef19d8-372f-49db-bbb6-0f5e16bfa625.filesusr.com/ugd/070799_0ea373f1af364355ad316b6238f38750.pdf?index=true
    • http://rutemosij.epizy.com/which_is_the_best_example_of_a_vivid_sensory_detail_every_day_or_two.pdf
    • https://9ebe8999-295a-4f11-87dc-c96f3e1b46ff.filesusr.com/ugd/8de238_981a94268fa34f5989625b5dbf48f418.pdf?index=true
    • http://perexuwofogefo.onlinewebshop.net/biblia_vanzarilor_jeffrey_gitomer.pdf
    • https://101c3d73-5e22-4da1-a203-a3a2a794ce88.filesusr.com/ugd/69a512_a27861c4b77e4e199d074c7370a1adc1.pdf?index=true
    • https://d03ec42c-8b93-48d3-a61e-9aee396c0db4.filesusr.com/ugd/1e557c_1498ea4ea24e4bba96aae28abb37715f.pdf?index=true
    • http://kaxuwenewutexu.myartsonline.com/wajizoren.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_off0000e7f5.bin
780b4d3e3d39c7fb77f34635d1a84e1f17de1c29ecb039e12b59a690190c6cb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F5 5492 bytes
font_01_sfnt_off0000fa99.bin
5d437bc1d901bcf861245c490360b74c151cf28485b95d6b9438195c5258d8f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA99 10856 bytes

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