Malicious PDF — malware analysis report

Static analysis result for SHA-256 21fd34e440f788f5…

MALICIOUS

PDF

83.6 KB Created: 2021-05-09 15:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 139a9cb5090aa5802af3d9a7093680e5 SHA-1: 490e76b26d92c49196d76ec058009780e43fe503 SHA-256: 21fd34e440f788f575d2b1b3c802dce9f19818eac6f41bbbb6b57a856c13fda9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs further indicates a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/strik?utm_term=order+of+operations+definition+go+math PDF link annotation
    • https://cdn.sqhk.co/kawinojos/hipvhdG/debusupisagalume.pdfIn PDF document text
    • http://nesobaka3.xyz/hamlet_2009_watch_online_freeozacg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486534/normal_605dd99a206b0.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/hfs1V6v/server_job_description_template.pdfIn PDF document text
    • http://betflixguvenilirmi.com/motikudud57i88.pdfIn PDF document text
    • http://kushtanash.ru/car_x_drift_racing_lite_mod_apk_downloadp60r4.pdfIn PDF document text
    • http://lumacy.site/8071382412101o0u.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369487/normal_5fc8331fde83c.pdfIn PDF document text
    • https://cdn.sqhk.co/jakofawesavo/oJwGVo7/aetna_claim_forms_online.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475375/normal_6007feeac7ce9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410462/normal_604186777afca.pdfIn PDF document text
    • https://cdn.sqhk.co/vemegunir/jejjib5/g_s_t_movie.pdfIn PDF document text
    • http://bumumapa.mypressonline.com/afcat_2_result_2020_download.pdfIn PDF document text
    • http://wotidoteked.mywebcommunity.org/antonio_gramsci_the_formation_of_the_intellectuals.pdfIn PDF document text
    • http://raxejudesezix.scienceontheweb.net/roku_soundbar_black_friday_2020.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/nosepevozux/67751927656.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/listado_de_verbos_irregulares_en_espaol_y_ingles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dc2b771-4634-4956-b608-5d0c0bc207bf/best_stories_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fab84b4-b573-4e92-b7bf-bf23317a6728/how_can_i_improve_in_my_english_speaking.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/company_of_heroes_movie.pdfIn PDF document text
    • http://palelezugob.onlinewebshop.net/ballast_water_treatment_system.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_off000106ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AB 5448 bytes
SHA-256: 5869cd538611d73862789c2e890c76159304bdb3be838a1f78e19477db9c7962
font_01_sfnt_off00011905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11905 11656 bytes
SHA-256: 308a1a71ed80c47d976167991bdaa81197d5e5bb4685202d4c2424508e71f1ea

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