Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdb204289c2bca43…

MALICIOUS

PDF

85.8 KB Created: 2021-03-15 09:39:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: afa5776376ab5f54814fbee707f977f4 SHA-1: 0b79d1e4fb3e8951484b482d09967e51e3964ee1 SHA-256: cdb204289c2bca4385780f1613cf9d3d5140965a7a1c679bbef528ae0779bc52
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external URLs, with several pointing to disposable domains and link farms, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing or trojan delivery mechanism. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used for initial access and potentially further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://fokemale.ru/wix?keyword=ortho+glass+splinting+manual+pdf PDF link annotation
    • http://chatik85939775.fun/56671287350pjgvc.pdfIn PDF document text
    • http://jagefefixod.22web.org/a_christmas_memory_by_truman_capote_movie.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451760/normal_604e924ddb7e6.pdfIn PDF document text
    • https://cdn.sqhk.co/tifisizeliz/jVjiith/xemogoxazo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386334/normal_600cb4ea6b6c7.pdfIn PDF document text
    • http://milanbeachs.space/3591496487699vgi.pdfIn PDF document text
    • http://marafonsport.site/71520328125eoonu.pdfIn PDF document text
    • http://itprod.space/olympics_2020_winter_or_summerqmx9o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367004/normal_604d171970924.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374540/normal_60219681c20de.pdfIn PDF document text
    • https://cdn.sqhk.co/mabisurud/bAhj31a/cheat_gacha_world_download_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/berirenike/4nXG4ji/beethoven_piano_concerto_5_sheet_music.pdfIn PDF document text
    • https://cdn.sqhk.co/sifajoxojif/icV0Zid/movie_box_hd_apk_download_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/kivutuzo/R3jcijF/temporal_prapositionen_ubungen.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365594/normal_5fcbd7cd1876e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://joxojivanajixuj.rf.gd/41001597342.pdfIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/6973289825.pdfIn PDF document text
    • http://sepitivodozinu.rf.gd/bulolimanowa.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/dazuweliv.pdfIn PDF document text
    • https://s3.amazonaws.com/sezewu/lawn_maintenance_estimate_template.pdfIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/summon_mate_best_monster.pdfIn PDF document text
    • http://lekinip.epizy.com/medicinal_chemistry_salary_usa.pdfIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/76905617569.pdfIn PDF document text
    • http://kipixuge.epizy.com/98115224860.pdfIn PDF document text
    • http://sutakepaxiru.epizy.com/fusionner_macbook.pdfIn PDF document text
    • http://xetixeguxiji.epizy.com/l_histoire_du_cambodge.pdfIn PDF document text
    • http://vozekalazasof.rf.gd/batawamodoxuvevakub.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_off00011365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11365 5484 bytes
SHA-256: f8b122eeb5712f1703f0286cc64e6e71222c8e0fba8e1126dc753f479dd1131c
font_01_sfnt_off000125e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E3 10464 bytes
SHA-256: efff7d56be4c8cf54c436a438d410f9217a646503212b11a9946b607d85b10e1

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