Malicious PDF — malware analysis report

Static analysis result for SHA-256 31cba73c234ede2a…

MALICIOUS

PDF

81.1 KB Created: 2021-04-02 09:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4aa60ecb08fe7ab76ac8ef77ff1c7b62 SHA-1: d51fb644e341d9d6745cc6927f5d9553fe7b4248 SHA-256: 31cba73c234ede2afdcca6c74326b79323d80ffa7eb6023244092a92d48fd3e0
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 'ponafet.ru', which is likely a malicious domain used to host or redirect to a secondary payload. The document body, though heavily obfuscated, suggests a lure related to learning JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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/award?keyword=learn+javascript+the+hard+way+pdf
    • https://cdn.sqhk.co/ravawiku/HhQVPhh/91647534223.pdf
    • https://static.s123-cdn-static.com/uploads/4389090/normal_5ff1c24a21121.pdf
    • https://cdn.sqhk.co/vumusokutil/oy1ggdG/survival_battleground_free_fire_gameplay.pdf
    • https://cdn-cms.f-static.net/uploads/4465556/normal_5fd3d8f1c8162.pdf
    • https://cdn-cms.f-static.net/uploads/4488317/normal_6039da671eda9.pdf
    • https://cdn.sqhk.co/suxujaba/LcSgj6E/bigukitupoxixozi.pdf
    • http://norikaloro.mywebcommunity.org/57451177294.pdf
    • https://cdn.sqhk.co/mubasetopagu/DCjfVji/pottery_wheel_studios_near_me.pdf
    • https://cdn-cms.f-static.net/uploads/4477864/normal_604315bd41671.pdf
    • http://bosuxezaxad.mypressonline.com/43625747468.pdf
    • http://jorowijedo.mywebcommunity.org/samsung_un55h6350_remote_control.pdf
    • http://kejurudoji.medianewsonline.com/zoxalunekotizawonusorow.pdf
    • https://cdn.sqhk.co/wujozuzewed/he0ghha/pathfinder_eldritch_scoundrel_guide.pdf
    • https://cdn.sqhk.co/gukokefa/jhbihkr/fowegosixokaw.pdf
    • https://static.s123-cdn-static.com/uploads/4373281/normal_5ffae51e161b5.pdf
    • https://cdn.sqhk.co/muwizavo/auihgee/raspberry_pi_zero_w_pinout.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f0d6a6e5-8c51-4ff6-b621-b33a01dadd6b/epson_perfection_v370_photo_scanner_installation_mac.pdf
    • http://kigokigaruv.myartsonline.com/17577663876.pdf
    • https://uploads.strikinglycdn.com/files/cd336e83-0a10-4d29-8abb-c172444bfc23/firakatigekozasanowili.pdf
    • https://uploads.strikinglycdn.com/files/e5657b8d-fadd-44b0-be10-aa4a312a360c/viwugezewariwagifonep.pdf
    • https://9f9bd9fa-00fe-4673-b34e-9a629881f524.filesusr.com/ugd/09273f_5bb050d4ec774aa39428808b62b2be40.pdf?index=true
    • https://4f65501f-cdae-4966-b9db-49b15ad9d196.filesusr.com/ugd/52b593_140909f9152d41c594eff008a11b1a13.pdf?index=true
    • https://9fb0fece-6c2a-4f8b-8ff1-5d9ea67f5ee7.filesusr.com/ugd/f6a907_b49df0dcc2e949679284c4c4573a9632.pdf?index=true
    • https://18b62485-dce0-4e35-9712-b1d1f13fcb23.filesusr.com/ugd/296484_109416db40a24c53a3b796859fd178b7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/84c638db-8cc1-4639-af02-6ba4db3bfdee/smart_body_scales_reviews.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_off0000f9e6.bin
e773853e96503ccbe434a6d5d1634b777a5b84dca7b1f371c879464f1cc0d6eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E6 5484 bytes
font_01_sfnt_off00010cae.bin
7cf4a06adb314c0c89a4eae0486d2caf8c3cb12ad18acee91cc8f548da57db29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAE 12220 bytes

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