Malicious PDF — malware analysis report

Static analysis result for SHA-256 50645d7519de7b78…

MALICIOUS

PDF

106.8 KB Created: 2021-03-24 00:12:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 71f292682baa7e9ac04cc437cd6d77e1 SHA-1: 9b12af720a9d2e368e4aac3a6959b6635b806351 SHA-256: 50645d7519de7b78de3a003b88227584e4d5e6497349869542d782ab5a5ad0cb
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, vilenefex.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 popular media to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://vilenefex.ru/strik?utm_term=magic+tree+house+movie+dailymotion
    • http://normal-id.com/andrew_loomis_methodujl9x.pdf
    • http://dvestideyli.xyz/97438881032cldfn.pdf
    • https://cdn.sqhk.co/momujolo/K6uEZic/21131928306.pdf
    • https://cdn.sqhk.co/detaludolef/cO5VifX/best_flocked_christmas_trees_near_me.pdf
    • https://cdn.sqhk.co/fuwunikuneg/hsihKic/29239674773.pdf
    • http://delabozaxexiris.getenjoyment.net/94470285769.pdf
    • https://cdn.sqhk.co/fexejikexew/v8ggiaG/7479790120.pdf
    • https://cdn.sqhk.co/jenireni/gdEeXBd/fruit_bowl_pop_art.pdf
    • http://snapchat-alert.com/nufubumifou53js.pdf
    • http://srakan.space/netosidymtd4.pdf
    • https://cdn.sqhk.co/livejizilul/hhhbha5/titixinuzesokizuxe.pdf
    • https://cdn.sqhk.co/sivunukiwe/cgjqhf8/stuart_rider_app_download_ios.pdf
    • http://dasezin.getenjoyment.net/medical_certificate_for_josaa_download.pdf
    • http://mainsale.info/94246171853holij.pdf
    • http://tuzirawejaw.mypressonline.com/85744134327.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tinezedu/how_do_you_tell_how_old_your_water_heater_is.pdf
    • https://s3.amazonaws.com/gumagabu/15669842739.pdf
    • http://pigutun.myartsonline.com/pifanamulapug.pdf
    • https://uploads.strikinglycdn.com/files/b0e9730a-040b-4e22-a6e7-668c59c53b92/edgar_allan_poe_books_in_order.pdf
    • https://uploads.strikinglycdn.com/files/1d7cca26-3e08-4a3b-9f4b-b3d019a6562c/how_do_you_pronounce_claude_monet.pdf
    • http://muluwokixo.onlinewebshop.net/37190214706.pdf
    • https://uploads.strikinglycdn.com/files/a1c1eb57-3eaa-469e-af2e-405c212cf05d/63987490022.pdf
    • https://s3.amazonaws.com/bexolamabad/amma_amma_telugu_ringtone_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001522a.bin
89cfdff501d282a241d36c3806e48142acb74824d07e92c02ad332644a01f01a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1522A 5192 bytes
font_01_sfnt_off00016449.bin
c053b540cfd41ebd3b1217d59465c0434e117b8651404103c5521b81a8a1413c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16449 5520 bytes
font_02_sfnt_off000176fe.bin
3de17410a9be77a95679b598a030a3426bed2223bd41e9db9516e6c314ba8279		 pdf-font-stream PDF embedded font (sfnt) at offset 0x176FE 11204 bytes

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