Malicious PDF — malware analysis report

Static analysis result for SHA-256 efcc86b3fd508cdd…

MALICIOUS

PDF

77.4 KB Created: 2021-03-15 17:59:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: c7a8079b189fcba9fadc3e352b302695 SHA-1: 4814f7660d2e2c53a4a71d8635ffe40c8628d781 SHA-256: efcc86b3fd508cdd4d68252e3e91e8f03fce99a645b7787a1053834bdfb04f71
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. Heuristics indicate it functions as a link farm, hosting numerous external URIs across multiple domains, with a high density of links on disposable hosting. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://kuzutuzo.ru/award?keyword=filariasis+pdf+usu PDF link annotation
    • https://cdn.sqhk.co/jelasusoved/HiajgXE/ninja_raiden_revenge_mod_money.pdfIn PDF document text
    • https://cdn.sqhk.co/vujagefamig/jihieNu/79392914502.pdfIn PDF document text
    • https://cdn.sqhk.co/muwunupudi/fYIFPPw/zaxevinodat.pdfIn PDF document text
    • https://cdn.sqhk.co/kewawukufiju/WiggdYY/57534059351.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452374/normal_601eadff48eb6.pdfIn PDF document text
    • https://cdn.sqhk.co/filajokajemu/jdjAvhf/sujunemowanosilamaw.pdfIn PDF document text
    • https://cdn.sqhk.co/vefuwebilux/aheklIV/91354339539.pdfIn PDF document text
    • https://cdn.sqhk.co/xidupesijij/ghKieie/les_bonnes_pratiques_de_fabrication_pharmaceutique.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402717/normal_60470252c8a5a.pdfIn PDF document text
    • http://logekolumo.22web.org/84425539339.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374703/normal_5ffb68eb13307.pdfIn PDF document text
    • https://cdn.sqhk.co/gesokusa/ibDBzid/twilight_blood_romance_otome_game.pdfIn PDF document text
    • https://cdn.sqhk.co/nomitusibop/hijjaha/10516363571.pdfIn PDF document text
    • http://kutometez.iblogger.org/828846454.pdfIn PDF document text
    • https://cdn.sqhk.co/pigalixow/Rih6hdV/91711123901.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412758/normal_601fd2f65df22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373261/normal_6013476acabed.pdfIn PDF document text
    • https://cdn.sqhk.co/tumosirewuw/djdghgg/life_is_strange_2_soundtrack_playlist.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416939/normal_5ffa7a0c9b45a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408702/normal_5fc9c1d89ebdb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://gexegufikide.epizy.com/midivutezamukatetez.pdfIn PDF document text
    • http://kusajonopabojos.rf.gd/bag_of_visual_words_python_example.pdfIn PDF document text
    • http://virixavop.epizy.com/lajunitomodugadam.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_off0000e5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DD 4460 bytes
SHA-256: b8afa7d26cf830f15d25ac9cf853950863ed052200960a2f2721618aac4be03c
font_01_sfnt_off0000f4fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FA 10972 bytes
SHA-256: 69b70970eca3b66811a9086bc1882428b98e3b24306ce894541055cfe8ede9f0
font_02_sfnt_off00011a3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3A 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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