Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf2ce43d574c0737…

MALICIOUS

PDF

87.5 KB Created: 2021-03-11 21:44:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 690f8ab3c4acfbccb9715e2352dabc07 SHA-1: 0fc322dc9976e71e030c186df21f07870d10a50f SHA-256: cf2ce43d574c0737b2d4bae61c307bf2b5efeb7a4609234e55cd5ad1b5ecce15
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/123?utm_term=tyre+size+guide+pdf PDF link annotation
    • http://fudopajir.iblogger.org/backward_caste_list_in_telangana.pdfIn PDF document text
    • https://cdn.sqhk.co/nudogada/igqftVt/22506358689.pdfIn PDF document text
    • https://cdn.sqhk.co/pofoxubo/JyQB6jd/gunshot_city_mod_apk.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/fajixe/bloons_td_5_mod_apk_revdl.pdfIn PDF document text
    • http://nosavanadir.rf.gd/ponniyin_selvan_book_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0921edb-21a8-4f4e-8943-dc40c9aefd47/navy_fitrep_opening_and_closing_statements.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/779ade20-d88a-4e74-9a62-216550c4778a/1996_club_car_ds_parts_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42dda2af-8003-4f46-93b2-ed8da52a8c1f/hound_of_baskervilles_chapter_7_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/98633296725.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e680062-919f-4994-a630-92c136fdc738/celestial_dragon_name_generator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6f39501-3d2e-4071-adc2-8dfc8a3baa29/drug_book_nursing_2020.pdfIn PDF document text
    • http://sumafalonedap.rf.gd/32113022697.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc842d82-7387-4ae8-bb2e-6a1b67522e80/jugukonajezupade.pdfIn PDF document text
    • http://ramejepazino.rf.gd/printable_star_template_large.pdfIn PDF document text
    • http://kezitiw.epizy.com/xalefagimawuzokokerurogu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ce39051-1503-4b5f-a269-0a0eca3a54b0/lifesmart_sereno_hot_tub_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/29716045611.pdfIn PDF document text
    • http://jikibepedoroto.epizy.com/convert_to_audio_file_app.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_off000118ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CA 5068 bytes
SHA-256: 7aaa03375a8f6271a764980c030b96180311250bc03a515364b9c55cfcc777bc
font_01_sfnt_off00012a32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A32 11476 bytes
SHA-256: 1ecf61fb28ba055eaa45b596c1ed1cf23a6f8761981b471ff420afad3136d620

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