Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed7f70507750db5f…

MALICIOUS

PDF

80.2 KB Created: 2021-04-07 01:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e4a240c28dc4e4f516e430088181fb8 SHA-1: 7bccfc12f8277bee54a3660b9493f7f7e1f36c74 SHA-256: ed7f70507750db5fcb98b11adac7452342e8d629a96743992665389b509342f1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, with a prominent one pointing to 'fokemale.ru' and disguised with 'utm_term=google+play++ios', suggesting a lure for users seeking app downloads. The PDF's structure and embedded links indicate it functions as a link farm, likely redirecting users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://fokemale.ru/123?utm_term=google+play++ios
    • https://cdn-cms.f-static.net/uploads/4501632/normal_5fd7a78f9d6a8.pdf
    • http://juzajikadig.22web.org/bpsc_ae_pt_syllabus.pdf
    • https://cdn-cms.f-static.net/uploads/4480755/normal_6020920d2b637.pdf
    • http://xirijapip.mypressonline.com/muxosokijefagesuwixubabo.pdf
    • https://static.s123-cdn-static.com/uploads/4465701/normal_5fc7481d4bece.pdf
    • http://kalanuso.iblogger.org/43406826188.pdf
    • http://tawaguf.scienceontheweb.net/xasenedezipu.pdf
    • https://static.s123-cdn-static.com/uploads/4414491/normal_5ff0ec1ce9d87.pdf
    • https://cdn-cms.f-static.net/uploads/4413702/normal_601eea4283002.pdf
    • http://masuvanoleseg.iblogger.org/41230791791.pdf
    • https://cdn-cms.f-static.net/uploads/4390366/normal_601e42fd822a2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://54a0e2cb-796f-4f80-9aaf-d11633176b06.filesusr.com/ugd/b0c554_def0b5070b174ff4a7790927bfa7f698.pdf?index=true
    • https://cd70d4e5-4a1a-4071-96d1-f2415ea5ece1.filesusr.com/ugd/7f46b5_8ab83172cd9d4bbbac4bbc5eed1da36d.pdf?index=true
    • http://vefugiw.epizy.com/dewosefufodokakaxarupor.pdf
    • http://nitiparavedo.epizy.com/70033844980.pdf
    • https://95fbbc11-640f-4658-acdf-6e09da746871.filesusr.com/ugd/e42ee3_290b2985fb524fd7bf0e56cb13bc143c.pdf?index=true
    • http://ratobewiwigu.atwebpages.com/92865193332.pdf
    • https://2172aa7b-56d6-4bcb-a12f-aafeda7c7725.filesusr.com/ugd/0d9129_acf890042e6b48138fa5e14a941cd764.pdf?index=true
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_f240b038c39e4ad9acf2e66911c6539d.pdf?index=true
    • https://33da92c3-26de-4f6b-bf12-1693cb6a6e79.filesusr.com/ugd/0307f2_0d0aa08ed04148878f3b8c6c4d75dca6.pdf?index=true
    • https://9526c93a-d340-4dca-b5fd-2864ff0888c4.filesusr.com/ugd/4c3d6a_a0cf2ab80ebd4116b88369554399ac6f.pdf?index=true
    • https://02bc4616-4eae-4b38-b2c9-0e654f754ee0.filesusr.com/ugd/069df5_5879b3464d334a128fd769ffa89f7ef3.pdf?index=true
    • http://faxiruvud.myartsonline.com/school_calendar_2020_rwanda.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_off0000fc76.bin
154e4a976903c057e12b6a36e3772045aa3f9f61cc58b706a36bd79949e48e72		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC76 5024 bytes
font_01_sfnt_off00010db3.bin
d310f0fcebbe9df2969a981f72b4ba793d2c510b4b35922e7b15e3b806b02d8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB3 11152 bytes

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