Malicious PDF — malware analysis report

Static analysis result for SHA-256 73ce3148c591d8ee…

MALICIOUS

PDF

83.5 KB Created: 2021-03-23 11:42:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c298f705450302e7eaeea61f96e995b SHA-1: eb0ed7c61684ea344299393bcc57ced38a5deffb SHA-256: 73ce3148c591d8ee16587d5b1ca31fded7ad3ff2675ecdc719a13663c6ddcfd1
96 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains an embedded URL pointing to 'vilenefex.ru', which is likely used to host a phishing page or download a secondary payload. The document's structure and heuristics suggest it is designed to trick users into visiting this external resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=words+to+start+off+a+first+body+paragraph
    • https://cdn-cms.f-static.net/uploads/4460963/normal_60191150debf4.pdf
    • https://cdn.sqhk.co/tesadubozino/Ahjjaju/hmrc_tax_refund_email.pdf
    • https://static.s123-cdn-static.com/uploads/4385235/normal_5feda187206f1.pdf
    • http://matteset-spon.space/syma_x5c-1_rc_quadcoptercq70x.pdf
    • https://cdn-cms.f-static.net/uploads/4421474/normal_60419a53e898c.pdf
    • https://static.s123-cdn-static.com/uploads/4421366/normal_5fe369f272165.pdf
    • https://cdn-cms.f-static.net/uploads/4416796/normal_5fd7cea9e670d.pdf
    • http://biotringel.shop/momasemelesowajefunigilajhk8s.pdf
    • https://cdn.sqhk.co/lubometusoz/agckigZ/bukuzuzinuxuwozokitafaku.pdf
    • https://cdn.sqhk.co/xexanodu/qdsgcii/9220793228.pdf
    • https://cdn.sqhk.co/tasaxasup/Widn3ja/bouncy_hills_mod_apk.pdf
    • http://musofiron.ru/bagpipe_sheet_music_thunderstruck7lwnm.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://f74ea38a-ab8d-49a0-8d31-9a1d7ce64423.filesusr.com/ugd/5ceade_dfd69367db1c4e5aad51149e494fe8ab.pdf?index=true
    • https://s3.amazonaws.com/metubevozisul/create_piano_sheet_music_online_free.pdf
    • https://uploads.strikinglycdn.com/files/611b4460-8269-4f74-b6b5-b83b11663997/vaxipiwevisumarumebex.pdf
    • https://7a1f2a0d-094a-4466-88af-72a4af93b9fa.filesusr.com/ugd/22739b_cd7790ca60ae4c4697031199fce9aae6.pdf?index=true
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_3b44b8e395a446a185df0f4fcccef673.pdf?index=true
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_e2d5abdc3dc64f92bcad740bab0ce2d5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d547d865-16ca-4fd4-80bd-066cb14488c6/5487004623.pdf
    • https://s3.amazonaws.com/xukonakefules/oracle_between_date_performance.pdf
    • https://uploads.strikinglycdn.com/files/110a0909-8bc8-42fc-ae7b-e104b54707bb/gotofiruzigabi.pdf
    • https://s3.amazonaws.com/godoremitiwuja/food_chain_food_web_worksheets_high_school.pdf
    • https://uploads.strikinglycdn.com/files/d832e8b6-11e7-434b-b687-9c7f813dced4/64930920501.pdf
    • https://uploads.strikinglycdn.com/files/a37f8782-8799-419e-8a76-6ada2a225da6/caracterizacin_y_organizacin_de_la_pequea_empresa_latinoamericana.pdf
    • https://s3.amazonaws.com/saxefi/texebagukevixinif.pdf
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_3a412e76624644fc8c6b8e0c328c9ed1.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7c6.bin
48bb6f746b1618dcc45a3ea121260e7d24412a3649f211a57030fda92d6120f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C6 5092 bytes
font_01_sfnt_off00010935.bin
819537521392041f098343449b945686eaae8fb7a01881147ff4ad1d1a8c4dcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10935 11588 bytes
font_02_sfnt_off00013036.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13036 4324 bytes

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