Malicious PDF — malware analysis report

Static analysis result for SHA-256 c74edf794581f0e3…

MALICIOUS

PDF

79.5 KB Created: 2021-03-01 00:39:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d608af7d9aa5122cdec5887bddd6b894 SHA-1: 7a8d4db42367042298a511be53e2c0e89c38ba88 SHA-256: c74edf794581f0e3e454b0d72a2968f8bec8c73454f04ed38d1b8e9eadb06ad9
104 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document body, though heavily obfuscated, contains references to 'robo call block app for iphone' and an external URI pointing to 'vilenefex.ru', suggesting a phishing or social engineering lure. The presence of embedded URLs and the overall detection by security tools strongly indicate a malicious intent to trick the user into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=best+robo+call+block+app+for+iphone
    • https://cdn.sqhk.co/wirowanorax/U2ul3ii/party_beer_pong_tricks.pdf
    • https://nelejezubifub.weebly.com/uploads/1/3/1/4/131406077/5013156.pdf
    • http://bejisosubonito.sportsontheweb.net/tekug.pdf
    • https://cdn.sqhk.co/lojosexotak/c5igggB/bojarisoro.pdf
    • https://cdn.sqhk.co/pefisemise/ggggeRJ/stack_attack_game.pdf
    • https://cdn-cms.f-static.net/uploads/4489595/normal_5fe8508d556b3.pdf
    • https://cdn.sqhk.co/noloxunipe/jhaaVja/tataman.pdf
    • https://static.s123-cdn-static.com/uploads/4486221/normal_5fc9e85b506f4.pdf
    • https://jikurufor.weebly.com/uploads/1/3/4/6/134613562/7160927.pdf
    • https://static.s123-cdn-static.com/uploads/4373776/normal_6003e7d60cf0c.pdf
    • https://cdn-cms.f-static.net/uploads/4388063/normal_6031da0f27a9c.pdf
    • https://worojuwoxalo.weebly.com/uploads/1/3/0/8/130814432/ab0ff30915528.pdf
    • https://static.s123-cdn-static.com/uploads/4484114/normal_5ffe6e22eea8c.pdf
    • http://nowukusox.mypressonline.com/how_to_make_rice_wine_step_by_step.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nojikigor.myartsonline.com/wegonigaxuxojiti.pdf
    • https://s3.amazonaws.com/xefejevife/lezuweduwipati.pdf
    • https://s3.amazonaws.com/dukajevo/ripeludijatatukobajuw.pdf
    • http://megigezorozo.atwebpages.com/time_management_tips_for_employees.pdf
    • http://jatoxat.atwebpages.com/tebelukideb.pdf
    • https://s3.amazonaws.com/kotenu/smith_hutson_scholarship_sfa.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_off0000f7d4.bin
db6956bd7a2ca4529256ae141019241ecb28e9cf44ebb7a504c016123a74c85d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D4 5356 bytes
font_01_sfnt_off00010a06.bin
905ea855f868943a0675fc3cd00aeed4c4649aa179f669d76c985ee82e034731		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A06 11188 bytes

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