Malicious PDF — malware analysis report

Static analysis result for SHA-256 79331fb82fc68bf1…

MALICIOUS

PDF

79.7 KB Created: 2021-03-23 17:48:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d76d2d6e721386bad97448dcc273d1c4 SHA-1: 484cf252fd627d8f265dff00a72c512a7ed422a3 SHA-256: 79331fb82fc68bf1d5c83802bbcbeaa03182197f07d47cf84ec72b95e2214463
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

This PDF document is identified as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to external URLs, one of which is a lure to install a browser extension or update. The document's structure and embedded links suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://leonvi.ru/123?utm_term=google+play+services+16.+0.+89+apkpure PDF link annotation
    • https://remejatezikame.weebly.com/uploads/1/3/1/0/131070309/jebeseni-bewoxolej.pdfIn PDF document text
    • https://cdn.sqhk.co/xuzalolotagi/CjgjjWB/airbnb_ipo_date.pdfIn PDF document text
    • https://cdn.sqhk.co/gevajoke/iRwJgiD/ktm_1290_adventure_2020_eicma.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/iYhjCib/full_hd_wallpaper_2020.pdfIn PDF document text
    • https://wotudopis.weebly.com/uploads/1/3/4/6/134679731/rotupabigekud.pdfIn PDF document text
    • https://rokozozo.weebly.com/uploads/1/3/4/4/134498035/02c1962ef966950.pdfIn PDF document text
    • http://xawuzina.iblogger.org/rewobifeturitekiwi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/34865330-88d0-43f4-b7c6-1255034981da/novap.pdfIn PDF document text
    • https://4b5f4e46-8b81-4257-bf39-61fc08ba57b0.filesusr.com/ugd/7ea8bb_b403f38d6d504c90afcf77c84af80c2f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/13483b3f-52dd-433b-81c1-be3f2569040b/20722561522.pdfIn PDF document text
    • https://f3b8d348-8566-49c9-a9f8-a2c3b9e1bc8e.filesusr.com/ugd/f1c748_7cce3f92e68045169be993230d905c95.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/01c675a5-011d-4814-a685-8e2ad618151d/wodewow.pdfIn PDF document text
    • https://a6f18165-9bfd-46c9-8f51-0ab50cd0b687.filesusr.com/ugd/265c7a_f528fb2c58004bc7b28f0393a052c2e7.pdf?index=trueIn PDF document text
    • http://vigogogakuza.epizy.com/effects_of_bullying_on_academic_performance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40553750-2eaf-4679-8179-079084068729/joseph_prince_latest_sermon_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46bab845-ac3e-4541-8711-2c5e587e5fff/asus_maximus_viii_hero_nvme_support.pdfIn PDF document text
    • https://d115d978-d96a-40c8-9764-5d959708fc35.filesusr.com/ugd/436160_9fb40df4952c4cba91355d6815239261.pdf?index=trueIn PDF document text
    • https://d6b7b3c7-8429-4d82-9d75-5d5d09e763cc.filesusr.com/ugd/a8c229_bf431724acc6499ea952e5327c086e23.pdf?index=trueIn PDF document text
    • http://tikikenuf.epizy.com/canon_eos_700d_manual_svenska.pdfIn PDF document text
    • http://gabepan.epizy.com/nifotawekifikisosor.pdfIn PDF document text
    • https://ced6af22-cf5f-4df0-9cd6-2d424634d287.filesusr.com/ugd/3eed2b_12ecb196c8cc45ceb2fa8ae01e4d801a.pdf?index=trueIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FB 6088 bytes
SHA-256: 2e6420e592961d97a431b488108ce6d34edeffeeb801f89de9866d1fdb529d03
font_01_sfnt_off00010bde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDE 10972 bytes
SHA-256: 0040a666c8c2bd8d1616e7b805db21e6e09722c63fbe7a952fa69cbdb6f0aa32

Open this report in the interactive analyzer, or submit your own file for analysis.