Malicious PDF — malware analysis report

Static analysis result for SHA-256 d500fd72ef37a7a9…

MALICIOUS

PDF

69.5 KB Created: 2021-04-12 13:18:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0cba706f0d5f447f667453e52c4c17cc SHA-1: 1111d92ae3b0e863d9613c6b6c5ebd5f6fb04c1a SHA-256: d500fd72ef37a7a90b53e932c6311fba86a379b774eefd6b77b37dbb5d99fd6a
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection mechanism to host malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://bologen.ru/strik?utm_term=how+to+compute+standard+deviation+on+ti-30x+iis PDF link annotation
    • http://es50off.pro/vexuraj4cc9p.pdfIn PDF document text
    • http://wellwork.site/70325478646dyt62.pdfIn PDF document text
    • http://bloodcraft.online/61550584871vkwwk.pdfIn PDF document text
    • http://maddot.space/nabegipuvarikunoary.pdfIn PDF document text
    • http://leafester.online/26194700034fqlu0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450641/normal_60636be226242.pdfIn PDF document text
    • http://zootime.store/467569476780rdd6.pdfIn PDF document text
    • http://bisibometixo.mywebcommunity.org/82146443223.pdfIn PDF document text
    • http://ladebizelase.scienceontheweb.net/neoplasia_endocrina_multipla_tipo_2.pdfIn PDF document text
    • http://majikok.mygamesonline.org/seoul_metro_map_2020.pdfIn PDF document text
    • http://003-center.ru/bijovirupizifyweeh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446773/normal_5fc679f4951e5.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/e905ac4c-281f-4e0b-9dff-9f7b8bff48e0/mmpi-2-rf_test_online.pdfIn PDF document text
    • http://funuduki.rf.gd/66110677544.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80188d16-f07f-4924-be1f-f9c7b42a6f55/curse_of_strahd_reloaded_wizard_of_wines.pdfIn PDF document text
    • http://wejelinemadagep.rf.gd/applicability_of_caro_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d3265b7-c13d-416e-bd3c-3406dc77c68e/99685327705.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F1 5704 bytes
SHA-256: a4a02688cf34f09afaab0d647712840ad8af692fd456c8eba4f6968b4ca4b932
font_01_sfnt_off0000e562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE562 10424 bytes
SHA-256: 63b7b688e7912a5891250ea1e384d058487b679e7db80c1fee6f3592515dc54f

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