Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b77628781c23e2e…

MALICIOUS

PDF

77.8 KB Created: 2021-03-24 17:15:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 781f644235940e3cdbee43a38b4adaa0 SHA-1: 7a9b50fea2fe254aaeb8738d273d68beabc2f2e2 SHA-256: 4b77628781c23e2e3b2392d60b367eb8b2faef4dfaf4dfab153a57149d0043d4
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, identified by heuristics and a machine learning classifier as malicious. ClamAV also detected this file as a phishing trojan. The presence of external URIs suggests an attempt to redirect the user to a malicious website, likely for phishing purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/wix?keyword=capitulo+2a+realidades+2+crossword+answers
    • http://iuts.space/free_tv_apps_for_ipad_canadaw0u2f.pdf
    • https://cdn-cms.f-static.net/uploads/4452588/normal_602e32eea0246.pdf
    • http://mojadejazisapa.sportsontheweb.net/2631704324.pdf
    • https://cdn-cms.f-static.net/uploads/4423699/normal_6033823fe7e97.pdf
    • http://muslims.net/letter_of_protest_sample4zpfm.pdf
    • http://raisinshub.club/how_to_fix_a_hunter_douglas_window_shadeqo52o.pdf
    • https://cdn.sqhk.co/kuzefoke/zNBsWgh/72115063777.pdf
    • https://cdn.sqhk.co/mozedizupi/hdVD0bZ/starcraft_15x15_clamshell_heat_press_bundle_mint.pdf
    • https://cdn.sqhk.co/lubigegek/hgegeja/super_soccer_3v3.pdf
    • http://tevaruv.sportsontheweb.net/pojab.pdf
    • https://lewaxirilukuxod.weebly.com/uploads/1/3/0/8/130813115/gakudusik.pdf
    • https://static.s123-cdn-static.com/uploads/4463264/normal_5fced9a814e72.pdf
    • https://vomizovuzib.weebly.com/uploads/1/3/1/6/131637161/fivevig-birexamidesi-zikalaxagaruf-nuzudedifafe.pdf
    • http://okclub.org/72337028018wpo9h.pdf
    • https://cdn.sqhk.co/jabisopomuxo/1mUgeid/pencil_boxes_walmart.pdf
    • http://plafond.xyz/automatically_pictures_in_outlook_2010_gpo94dkv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/555ce06f-bd16-41d3-8563-a43d681ec567/progress_in_mathematics_grade_3_textbook_download.pdf
    • https://uploads.strikinglycdn.com/files/188f91a1-65f9-4b70-9096-ac48c1c92793/ap_biology_lab_report_example.pdf
    • https://uploads.strikinglycdn.com/files/d37e935e-fb8f-4e6a-9411-5be43e4c5434/pezibanebutode.pdf
    • http://gubadif.myartsonline.com/electrical_engineer_salary_jacksonville_florida.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_off0000ee70.bin
3b005a39a81acaa4a0bc1571185e74c60e6565cc22f0271b9a36a88f18c7f064
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE70 5196 bytes
font_01_sfnt_off00010037.bin
881660eadd455663f29b69021f167e57b7a4e58b393b2972301c9ef17a45a58e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10037 11808 bytes