Malicious PDF — malware analysis report

Static analysis result for SHA-256 3901ff4767be876a…

MALICIOUS

PDF

77.9 KB Created: 2021-05-13 10:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 62830e8552441e350190d419426db6d3 SHA-1: 775a6a07d9c76b6b117b84ce9a89b11cdb94f9b5 SHA-256: 3901ff4767be876a428526426b9bc7b10cfa7c62ae5527b2866f6b2194079aa0
96 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 an embedded URI pointing to a suspicious domain, 'ponafet.ru', which is likely used to host a malicious payload or redirect to a phishing site. The document body, though heavily obfuscated, suggests a lure related to a book title, aligning with common social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/strik?utm_term=what+age+is+call+me+by+your+name+book
    • https://cdn-cms.f-static.net/uploads/4401732/normal_601bfc91a6bdc.pdf
    • http://mimisijuz.mypressonline.com/xeduzaruluxitodu.pdf
    • https://static.s123-cdn-static.com/uploads/4413111/normal_5ffa8dcf9496d.pdf
    • https://static.s123-cdn-static.com/uploads/4373281/normal_5ffae51e161b5.pdf
    • http://lorozetuwivu.medianewsonline.com/1975_evinrude_9.9_service_manual.pdf
    • http://figimumagoko.mygamesonline.org/nosukiromusirimawot.pdf
    • https://cdn-cms.f-static.net/uploads/4409826/normal_6063d46fe361d.pdf
    • https://cdn-cms.f-static.net/uploads/4454425/normal_605caabf68ece.pdf
    • https://static.s123-cdn-static.com/uploads/4446030/normal_5fee0d0356639.pdf
    • https://cdn-cms.f-static.net/uploads/4384299/normal_601aff1618d99.pdf
    • https://static.s123-cdn-static.com/uploads/4486037/normal_5fffef3ae8700.pdf
    • http://viwafuxofiseko.getenjoyment.net/antrenmanlarla_geometri_2._kitap.pdf
    • http://finofubamu.mygamesonline.org/67740097050.pdf
    • https://cdn.sqhk.co/fudopalizew/heL2gd6/turbo_dismount_mod_apk_pc.pdf
    • http://koxelovanalimu.getenjoyment.net/what_amendment_was_violated_in_brown_v._board_of_education.pdf
    • https://cdn-cms.f-static.net/uploads/4372960/normal_60394af59d39e.pdf
    • https://cdn.sqhk.co/fegujajox/gQxjgia/papekuvewidamunorenil.pdf
    • https://cdn.sqhk.co/merabuvi/Zm8hanU/download_clash_of_clans_hack_version.pdf
    • https://cdn-cms.f-static.net/uploads/4408584/normal_601db57956f4c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c8ce3f3c-fdfd-445b-bb00-4fb86fc15793/gumujitogofesepe.pdf
    • https://uploads.strikinglycdn.com/files/a569b58a-8b4e-46f4-9fed-d164cf22a7e9/17668516979.pdf
    • https://uploads.strikinglycdn.com/files/e1c1a53e-02e7-47fd-9b9a-2adc799e1f99/libro_de_geografia_4_grado_pag_128_y_129.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_off0000f20d.bin
5e37a238b456c3f52daa9ea891e3d9533d432c1d52ef0d0639f298199e701e6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF20D 5532 bytes
font_01_sfnt_off000104cb.bin
63eaa688a6a125b9cfa7fcde9e9d53eb85bb7442b79ececf9820444077f8144b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104CB 11040 bytes

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