Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c0ad91216706799…

MALICIOUS

PDF

64.5 KB Created: 2021-03-22 05:58:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 84230d150ff3f86104eb33e8c65a2d54 SHA-1: d014151de0c2c0d9fd1a898c06b4e419b64fed93 SHA-256: 0c0ad91216706799c011ed7b6bf24cb5f52777eabd841f7b55a12147724ad025
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains a large number of external links, many of which are likely part of a link farm or SEO manipulation scheme, with one suspicious URL pointing to 'kuzutuzo.ru'. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to lure users or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/wix?keyword=algebra+1+problems+and+answers
    • https://cdn.sqhk.co/mitugejaxel/e2iiiau/baby_yoda_ornament_diy.pdf
    • http://janusadow.mygamesonline.org/examen_ser_bachiller_enero_2020.pdf
    • https://cdn.sqhk.co/lamijaluxeso/Qjbejem/final_fantasy_xiv_shadowbringers_soundtrack.pdf
    • https://cdn.sqhk.co/xufuwejaxe/geiBU9v/juegos_friv_redboy_and_blue_girl.pdf
    • http://dibiwarisogix.mygamesonline.org/bvg_map.pdf
    • http://rowexusaje.mypressonline.com/54000634583.pdf
    • https://cdn.sqhk.co/gegenosuzun/ihShjie/wikipedia_nearby_api.pdf
    • https://cdn.sqhk.co/riwutosax/fhcihff/xitukame.pdf
    • https://cdn.sqhk.co/jobiwokojo/jgagxhb/xuret.pdf
    • http://nopotaz.medianewsonline.com/what_are_metric_measurement_units.pdf
    • http://linavaluviriv.getenjoyment.net/blood_bowl_list_of_teams.pdf
    • https://cdn.sqhk.co/jalivotenos/cFjghfZ/pcsx2_emulator_for_pc_windows_7.pdf
    • http://nezowigivomi.scienceontheweb.net/how_to_turn_my_gas_fireplace_off.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://53002a68-e35f-4167-ac88-1ab9777d7e72.filesusr.com/ugd/f5bc2a_499ca2c539de4ab0b300f97321daa2a5.pdf?index=true
    • https://e8dc5420-792a-4861-90db-09cfc8d8a7d1.filesusr.com/ugd/1378f5_65631ece23a246278991a61917e3d828.pdf?index=true
    • https://c03439ef-6557-4199-865e-586791a52b6c.filesusr.com/ugd/6bb4a2_0d3a6f68c9614febb9ad4edd8f1d72b8.pdf?index=true
    • https://fb79ad55-22b5-4823-9538-35c71bbbd514.filesusr.com/ugd/ea423f_15ffe53bcfe944d188abc07bf7a25020.pdf?index=true
    • https://29ca30ec-7ad4-487f-8637-d2d67f3a323c.filesusr.com/ugd/10b11f_6d9fe08896dc4c768438ccc6e6b124e2.pdf?index=true
    • http://dusameferadulo.onlinewebshop.net/skripsi_brand_awareness.pdf
    • https://03aaa7dd-6608-466c-a68c-f41c59811c05.filesusr.com/ugd/ae15ca_22db2479c95b43b39eec43684f24cafc.pdf?index=true
    • 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_off0000c163.bin
3214f2c58f61fb141b00395e410bbfeee9018a18b59b53de1c5af1adc6a4fa12		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC163 5552 bytes
font_01_sfnt_off0000d43c.bin
003773511b274a46211e508b6669954e0c76e24168ceccb80a530461412621ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD43C 9564 bytes

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