Malicious PDF — malware analysis report

Static analysis result for SHA-256 d76d03cdf5c05118…

MALICIOUS

PDF

70.1 KB Created: 2021-03-31 10:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 30ff7e19ce70b05feb70492969bef5d0 SHA-1: 479bff90fb603661ca7d1445dc0786867d796126 SHA-256: d76d03cdf5c051187c63d2fd4b1f96c22e4b553c2e93617217e271491914e54d
134 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm PDF hosted on disposable domains. The embedded URI points to a URL designed to appear as a free download for a technical standard, likely a lure for phishing or malware. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kuzutuzo.ru/award?keyword=asme+b31.+1+pdf+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365580/normal_60415f70c5a9f.pdfIn PDF document text
    • http://proba7.xyz/762095660283rbq6.pdfIn PDF document text
    • http://bcpreactiva-enlinea.com/como_calcular_mi_pago_de_seguridad_social4r1jj.pdfIn PDF document text
    • http://rezotu.xyz/runecrafting_money_guide_rs3huef3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378406/normal_60372058b50de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455178/normal_6021a56d717dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380854/normal_5fdf7a694f68c.pdfIn PDF document text
    • http://jojazinex.mygamesonline.org/juxezerekeve.pdfIn PDF document text
    • http://zovitidagawas.sportsontheweb.net/virtues_and_vices_aristotle.pdfIn PDF document text
    • http://liberum.sportsontheweb.net/rilusevaxemofowato.pdfIn PDF document text
    • http://ziwigosopijulal.mygamesonline.org/george_washington_gomez.pdfIn PDF document text
    • http://mufexamuxino.iblogger.org/bankart_repair_rehab_protocol.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuvezosapa/ijfidic/best_id_card_scanner_app_free.pdfIn PDF document text
    • https://cdn.sqhk.co/nilulugaj/gihb8hf/guess_the_lyrics_country_music_quiz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ba5e11b-dbe3-4ea8-9a4e-41ccb6514dbf/is_bounce_tv_on_xfinity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e63bfeb-0073-43ce-8d04-be96b2313bc5/brother_mfc_7360n_wireless_setup.pdfIn PDF document text
    • http://daxepusiz.rf.gd/4213882639.pdfIn PDF document text
    • http://barajolu.rf.gd/is_internal_audit_a_good_career_choice.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2847b71c-1527-4c3c-af81-c55980cab578/how_to_remove_petsafe_collar_battery.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_off0000d2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CF 5656 bytes
SHA-256: 05b65fe991009abb22200223d584c86f8984ed30d51e11f060656e9de11df73c
font_01_sfnt_off0000e60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60D 11004 bytes
SHA-256: d28458b42aad8cccbb57926d6f0cdbbdc24e76fff714316c6e70fcbe37bf9cfa

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