Malicious PDF — malware analysis report

Static analysis result for SHA-256 af433a98d93eee4f…

MALICIOUS

PDF

68.8 KB Created: 2021-03-10 15:58:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 68634b4701cd868931c429623c9e8b31 SHA-1: 11e86f8030f6cfa862b0f32d6e4d9b4c23f6ed55 SHA-256: af433a98d93eee4fb5e955cc25a97005a61f30ea58ae5c4aba9f4a53ea10167d
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, and ClamAV detection confirms its malicious nature. The document body, though heavily obfuscated, suggests a lure related to academic materials, aligning with common phishing tactics. The presence of multiple unknown reputation URLs further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://mezovuduw.ru/aws?utm_term=dennis+zill+complex+analysis+pdf+solution+slader
    • http://triple-doska4.club/puvuvamivorediz6yuph.pdf
    • http://trynutra.shop/breviary_in_english9006l.pdf
    • https://cdn.sqhk.co/mujowofapubi/ifIjjjg/mirudejigotemekusipera.pdf
    • http://filanion.online/zekotelijigomevkaumv.pdf
    • https://cdn-cms.f-static.net/uploads/4425909/normal_6013f6bab724f.pdf
    • http://mishgen.com/tejojipifimewalhttn3.pdf
    • https://static.s123-cdn-static.com/uploads/4379964/normal_5fe4a1d338c0b.pdf
    • https://cdn-cms.f-static.net/uploads/4383806/normal_601134fcc1d9e.pdf
    • https://static.s123-cdn-static.com/uploads/4454550/normal_5ff2b0926e3a0.pdf
    • https://static.s123-cdn-static.com/uploads/4503525/normal_5ffd075492099.pdf
    • https://static.s123-cdn-static.com/uploads/4467274/normal_5fcb77c7350a1.pdf
    • https://static.s123-cdn-static.com/uploads/4530036/normal_5fceec01b8462.pdf
    • https://cdn-cms.f-static.net/uploads/4393755/normal_600b767d2463e.pdf
    • https://cdn.sqhk.co/besudamuge/jnpVNxT/flip_flops_menu.pdf
    • http://fragcups.com/rotirakozigujagawetcwif.pdf
    • https://cdn.sqhk.co/gabixeme/bihUIie/space_for_baby_chicks.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/73b61104-879d-4f31-b037-be2da71c6b4e/lobogigerajitojibibamo.pdf
    • https://d0bf7e8b-5449-41c0-93e9-161603c0719f.filesusr.com/ugd/197ed4_f090d6daf7054c2b91a14447cf981979.pdf?index=true
    • https://9539e3d7-93ad-434a-85ac-22bd9bdb82bb.filesusr.com/ugd/df7b34_707c565dc31b48508c2cae0d77d66505.pdf?index=true
    • https://c2093f15-f4fb-4bda-9582-db5404103fa6.filesusr.com/ugd/b28561_f243feb17f67437bb51baf9a32e5d696.pdf?index=true
    • https://uploads.strikinglycdn.com/files/adce9c51-6fa5-46a7-abed-336dd0d80234/6693920184.pdf
    • https://9f503c4c-bf14-4dcb-9a7a-68e0e5bb3568.filesusr.com/ugd/8ac1ab_519eaa1f5e884804a5569db368a3d3d6.pdf?index=true
    • https://3d7c42e8-cad9-4196-8f3c-0f210fd97588.filesusr.com/ugd/1b7c00_0fbac881708b4f48b2ba2459ea0b5355.pdf?index=true
    • 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_off0000d0f6.bin
8a9acc95d5a1dc94ed8bd82d2b0a0c4604372838332e0275dac1d8ca737a62f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F6 5520 bytes
font_01_sfnt_off0000e3c2.bin
8c6dc6b46ca802ba7476f07fbabde5d2ae6ed08ef6e6d5736d72055bead9b5b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C2 9732 bytes

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