Malicious PDF — malware analysis report

Static analysis result for SHA-256 9350869153c9fc25…

MALICIOUS

PDF

79.1 KB Created: 2021-03-13 22:01:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac92add71ee34b4083cdf4132e82cfc2 SHA-1: 2e9ceed04b97efd33cd901cf5a93d06447a3cefc SHA-256: 9350869153c9fc25c12225bdbdba21d8f3b8f18eb256bbc5b2103b3795c31d4a
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. The PDF contains a large number of external links, with a critical heuristic identifying it as a PDF SEO link farm. The primary malicious activity appears to be directing users to external URLs, such as http://zzzmmmmejjj.space/favumaban859y.pdf, which likely serve as a distribution point for further malicious payloads or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/wix?keyword=ti+83+calculator+online+iphone
    • http://zzzmmmmejjj.space/favumaban859y.pdf
    • https://cdn.sqhk.co/wujejelot/00Pigid/mejujofigedogizedinudotul.pdf
    • https://cdn.sqhk.co/tijinujul/jjfAnhf/80186731286.pdf
    • http://makedctl.site/tc_electronic_hall_of_fame_2_x4_pricef5oka.pdf
    • http://com-signto2.xyz/lozonapijafisevil7mvn5.pdf
    • https://cdn.sqhk.co/bapisolel/w6oMhdM/97651029160.pdf
    • https://cdn.sqhk.co/lajawawinu/pifja0k/gotasomesetaveji.pdf
    • https://cdn.sqhk.co/vomikigiw/4Lwhjij/microsoft_teams_download_for_windows_10_64-_bit.pdf
    • http://instgramcopyrightdispute.com/431310200080p96b.pdf
    • https://cdn.sqhk.co/powirafawume/hyk8icV/24581458284.pdf
    • http://osmosiotzs.fun/tipos_de_valoracion_acido_basecm492.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d848e4b6-662b-4424-a759-963270729452.filesusr.com/ugd/30e015_021cc25f6ff04653bac651bfaacbd668.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e6a6a849-8a95-472a-8763-30b360679a46/animal_farm_book_chapter_4.pdf
    • https://da18e6a8-d720-42de-a88c-3f13daad7efb.filesusr.com/ugd/08fe48_8b9961c4ae284ec1a511f29af7c273ef.pdf?index=true
    • https://8d5bcf17-53f2-4f21-b585-7a27aef14131.filesusr.com/ugd/7baf93_705bbb48827f4a9aa756ef4879872f81.pdf?index=true
    • https://uploads.strikinglycdn.com/files/dc156c79-79a4-4603-88d3-a44aafebbdff/serato_dj_pro_free_download_full_version_32_bit.pdf
    • https://92ddf5cc-4ce7-4caf-b117-8241c553a727.filesusr.com/ugd/42bae0_d63fa932fa794a48b5df1f052630ae0e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6b14749c-4c74-4f33-8003-5756593a132f/hello_adele_karaoke_download.pdf
    • https://uploads.strikinglycdn.com/files/e927d3f3-ce20-4add-9acb-0345a5b76684/79136784474.pdf
    • https://uploads.strikinglycdn.com/files/3f13448d-bf7b-4830-8605-17009e3a313a/medaruzixa.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_off0000f7bf.bin
1d3dcf96c03ee610d0917af98197e72a13b562ff71d6532838ac8c7a4047af37		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BF 5152 bytes
font_01_sfnt_off00010941.bin
4411de41aad887a9df3ce8354eff3d41734a84349a07862572d898155d96814e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10941 10976 bytes

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