Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccbdb50c440c5b5a…

MALICIOUS

PDF

86.1 KB Created: 2021-03-20 05:05:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: c1d2d9c85124db537236e46a832165cd SHA-1: c9f0436b33feba312735e33db99a6a1f4c7a6018 SHA-256: ccbdb50c440c5b5af5be7da8ddc45d0cea554ec042bd711cf34d08aadde22e68
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs, with a critical ClamAV detection and a high ML classifier score indicating malicious intent. The presence of numerous links, including one to 'all-system7.xyz', suggests a link farm or redirection mechanism. The ML classifier output of 0.999838 strongly supports the malicious verdict.

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://zajinet.ru/award?keyword=chemical+oxygen+demand+and+biological+oxygen+demand+pdf PDF link annotation
    • http://all-system7.xyz/xavosawg9ip.pdfIn PDF document text
    • https://cdn.sqhk.co/fugapaloter/fMgc3Go/best_space_live_wallpaper_app_android.pdfIn PDF document text
    • http://hellesypakk.online/14023873875hhzuz.pdfIn PDF document text
    • https://cdn.sqhk.co/xavipinav/ihZNjhG/road_trippin_e_chords.pdfIn PDF document text
    • https://cdn.sqhk.co/bevoletef/hejemBx/management_skills_assessment_center.pdfIn PDF document text
    • http://tryse.xyz/pafuzuxuziweforanaviwvq3w.pdfIn PDF document text
    • http://modalidetefid.iblogger.org/26866053402.pdfIn PDF document text
    • http://jikovuruwigifan.iblogger.org/lafozomur.pdfIn PDF document text
    • http://gazzsheff.xyz/resonate_book39zxz.pdfIn PDF document text
    • https://cdn.sqhk.co/zuzonoviza/UjhjawA/curse_of_the_werewolves_mod_apk.pdfIn PDF document text
    • http://vk-settings-change.online/4._Compara_y_contrastar_teoras_tempfkwda.pdfIn PDF document text
    • http://regvoolkim.website/wigosuxedow9zc5.pdfIn PDF document text
    • http://espaceabonne.com/guild_fest_lords_mobile_guideiqc8j.pdfIn PDF document text
    • http://kvyovk.xyz/penegadami0dvmx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pewesinelukaveb.epizy.com/67358673128.pdfIn PDF document text
    • http://perufukag.epizy.com/77252627788.pdfIn PDF document text
    • http://gojetovumivet.epizy.com/juzofi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f78e3fa8-90c8-4754-bfcf-d2c04a57a684/gejaxirixudopowegodov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c964aad-4c48-4c0c-85a5-a57d7f3d13e1/furajukudi.pdfIn PDF document text
    • http://kuxixatizoxop.epizy.com/1100513615.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_off0001139c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139C 5508 bytes
SHA-256: a2a722eb6426b210849f426916e2c6f17be3e038970c2a24e991f3252ac3f402
font_01_sfnt_off0001263f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263F 10704 bytes
SHA-256: 8d046bb5e178203636f076a60b6656506cbea9dd33e92c925bdabcf7f0b85e15

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