Malicious PDF — malware analysis report

Static analysis result for SHA-256 893bbc973b564664…

MALICIOUS

PDF

76.3 KB Created: 2021-02-27 00:17:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 9d4a3deb49c27a3df92771b6fa9819ab SHA-1: 94cc879f55f51b55e1caa2f3d45064c6ae71d108 SHA-256: 893bbc973b5646649a547ec17cb76eb767dd0ebfbead4d9bd2f044fb8d789f45
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, contains text related to 'Santa rosa county bus schedule', suggesting a lure. The presence of numerous external URIs, including one pointing to 'jumiwimov.ru', strongly suggests the document is designed to redirect users to malicious sites, likely for phishing or to download further payloads. No scripts were extracted, but the PDF structure itself contains malicious elements.

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jumiwimov.ru/award?keyword=santa+rosa+county+bus+schedule PDF link annotation
    • https://cdn.sqhk.co/kagelemovo/9jfX6hh/superhero_cars_racing.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366965/normal_5ffa4f9c59e44.pdfIn PDF document text
    • https://cdn.sqhk.co/timafewa/1fjdjdN/virus_the_game_iso_download_xbox_360.pdfIn PDF document text
    • http://ptmonline.ru/sadlier_vocabulary_workshop_level_e_answers_unit_1557w3c.pdfIn PDF document text
    • https://cdn.sqhk.co/rapovixovuti/fjhugjk/zuvivegijape.pdfIn PDF document text
    • http://zebolalifitu.22web.org/gezisaxuguzatakazusumeg.pdfIn PDF document text
    • https://cdn.sqhk.co/mujejadalale/jjghNkx/48576100021.pdfIn PDF document text
    • http://filewawoke.iblogger.org/87746113926.pdfIn PDF document text
    • http://virepidutajal.iblogger.org/sinopsis_film_the_collector_2009.pdfIn PDF document text
    • http://islta.fun/vedawajemarhdvhf.pdfIn PDF document text
    • http://7lessons.fun/7133319083772rmw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lekaleramitogal.rf.gd/adobe_acrobat_pro_dc_introduction_quick_reference_guide.pdfIn PDF document text
    • http://gamemogap.epizy.com/nokunurukoxi.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/google_analytics_tutorial_android_studio.pdfIn PDF document text
    • http://resegubus.rf.gd/zukawivuwara.pdfIn PDF document text
    • http://fixadamobus.epizy.com/cisco_jabber_for_windows_admin_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/99706860167.pdfIn PDF document text
    • http://werewej.epizy.com/xubutefukitovif.pdfIn PDF document text
    • http://keximatefabuzi.rf.gd/5887854852.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_off0000ee69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE69 5372 bytes
SHA-256: a5c9c30ecf5579322c3058f0f5cea3b90861e61dc15fbf3c3af28423b152d4ea
font_01_sfnt_off0001009d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009D 10252 bytes
SHA-256: e2d9ea28a3457eb3f531bddecba8c05b64f629ffa027852efcd849b9f3c3d7eb

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