Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0d47c265ee709e9…

MALICIOUS

PDF

84.9 KB Created: 2021-02-17 01:51:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: f4f1d58fe50fa1615caf7f8ba47b3fc4 SHA-1: 88c97d75bba9d915302a7614e005dbd4918dd4c7 SHA-256: c0d47c265ee709e935bf8e4f029dcb15b150bf57814a6f1c21868389b6073ac9
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicative of a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient to infer a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://maypoin.ru/strik?utm_term=navy+graduation+dress+code PDF link annotation
    • https://cdn.sqhk.co/wajuletixex/BicDpie/75678429276.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478398/normal_6024ab903f766.pdfIn PDF document text
    • https://cdn.sqhk.co/vagizabibo/jeyeZjc/hill_climb_racing_best_vehicle_for_neon.pdfIn PDF document text
    • http://eduha.online/fiwamibegufoxosulofosm6ws.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383804/normal_5fca3e18be743.pdfIn PDF document text
    • https://cdn.sqhk.co/duromivap/iaSgujd/warlings_armageddon_download_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/vavewiminiv/v1gDje5/mezapaduse.pdfIn PDF document text
    • https://kajubogoxin.weebly.com/uploads/1/3/0/9/130969430/wabesadefegiduv.pdfIn PDF document text
    • https://cdn.sqhk.co/wepurodapike/Sih6V38/91243219068.pdfIn PDF document text
    • https://cdn.sqhk.co/fogibadeku/jejbijz/41826924101.pdfIn PDF document text
    • https://kokazokurazafan.weebly.com/uploads/1/3/5/3/135348127/zeramerupukujovad.pdfIn PDF document text
    • https://cdn.sqhk.co/podidiwi/CcBlKgj/u_box_tv_streaming_site.pdfIn PDF document text
    • https://cdn.sqhk.co/devurekon/Z4ihngh/29463190716.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407060/normal_5fd04c334bb35.pdfIn PDF document text
    • https://nutifikidejuz.weebly.com/uploads/1/3/4/3/134347692/4373427.pdfIn PDF document text
    • https://cdn.sqhk.co/ligumorik/gi3KThj/44479597440.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tewamenuve.rf.gd/8504327216.pdfIn PDF document text
    • http://lapekekefexe.rf.gd/tegomupirawopirewup.pdfIn PDF document text
    • http://puxetixunelotaz.epizy.com/hill_house_school_ofsted_report_2015.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001023d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023D 2896 bytes
SHA-256: 6c2ca0967614ddcc76f5703ee42782f1d1c30567c033c3a9c21d169cdbcda75a
font_01_sfnt_off00010c8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8B 5208 bytes
SHA-256: 8de04ce64c18efdf6641a003c47b5056f93b45fab92337174a5d0292465eb352
font_02_sfnt_off00011e69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E69 11712 bytes
SHA-256: a93ab34081abd9492f4c56ad1082a865a67e22659e5974e0101e790fb8c0044e

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