Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef88887c8f6c853f…

MALICIOUS

PDF

72.0 KB Created: 2021-03-30 11:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: b6d06fa5ec7d20d3d8a04f4a9b66d085 SHA-1: d6b770198839c5ecabaf41d2db09a2c3dd68e36a SHA-256: ef88887c8f6c853fc7905109a37dd5387a76474acb7ca58387ca4576d105e99e
96 Risk Score

Malware Insights

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

The PDF document contains an embedded URL that appears to be a lure, disguised as a search result for an anatomy atlas. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristic suggest it's designed to redirect users to a potentially harmful external resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/award?keyword=ct+brain+anatomy+atlas+pdf PDF link annotation
    • http://jisetatiloro.scienceontheweb.net/aryabhatta_images_download.pdfIn PDF document text
    • http://goromeo.club/la_biblia_catolica_descargar_gratissc1zd.pdfIn PDF document text
    • http://kumululurug.scienceontheweb.net/what_are_the_different_types_of_intimate_relationships.pdfIn PDF document text
    • http://qwonder.space/playerunknown_s_battlegrounds_pc_game_freee0y6p.pdfIn PDF document text
    • http://kleomaften.online/jabadexovewajulolebon48te3.pdfIn PDF document text
    • https://cdn.sqhk.co/zidexamuwela/hQjbmhh/led_controller_pc_software.pdfIn PDF document text
    • https://cdn.sqhk.co/mafulavet/iehjZgf/pmi_project_management_methodology_ppt.pdfIn PDF document text
    • http://wrestling-mma.com/62339428753rrjke.pdfIn PDF document text
    • http://jekeluxuto.mywebcommunity.org/75389113170.pdfIn PDF document text
    • http://rent-nout.site/51402267756utpac.pdfIn PDF document text
    • http://ratedewu.scienceontheweb.net/power_pressure_cooker_xl_manual_e3.pdfIn PDF document text
    • https://cdn.sqhk.co/likunubiba/hbyiiih/inspirational_stories_work_life_balance.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ligole/bunepiworirupumavo.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/banjo_full_movie_watch_online.pdfIn PDF document text
    • https://f3ea461b-95fd-44cf-949c-5afda193840f.filesusr.com/ugd/a48928_7d4a2bd13d3141cca1a32e4d9c630e34.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ginutu/faxilotujikipetugelufut.pdfIn PDF document text
    • https://a519209a-2b0a-481f-9fe9-460c873bdc80.filesusr.com/ugd/270e53_d6b05adc98844eb49b62a2a3b19f83f4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/27552212943.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3D 5332 bytes
SHA-256: d31d07b37e501af1b3f7951acd293119aeb5894429d181b9b3fb054f7856a1e4
font_01_sfnt_off0000f044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF044 10140 bytes
SHA-256: d84cceee7a6de68b4dcf5aa6461461c637d82e243c5f2e7165d1369056c70207

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