Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7af7e0b05012d04…

MALICIOUS

PDF

77.0 KB Created: 2021-03-09 08:46:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 2f8b6357f0d32b89f0fb3a0d34e49293 SHA-1: 99a63ab988ab68a2f8d6ca6d37f1e7c593ec8974 SHA-256: b7af7e0b05012d04087f9be1704b6637e166b2df6171c4efbba897b445494200
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/123?utm_term=free+microsoft+excel+monthly+budget+template PDF link annotation
    • http://lolafoduluj.22web.org/bubble_shooter_apk_file_latest_version.pdfIn PDF document text
    • http://vofefipegurixu.iblogger.org/vusogazifoxugetujibevefek.pdfIn PDF document text
    • http://in-arenas.com/john_deere_455_box_drill_for_salef9ril.pdfIn PDF document text
    • https://gatodagimisosog.weebly.com/uploads/1/3/1/3/131379801/7694008.pdfIn PDF document text
    • http://nibakelenixezas.getenjoyment.net/publicacion_proactiva_declaracion_de_bienes_y_rentas_y_registro_de_conflicto_de_intereses.pdfIn PDF document text
    • http://pekibexuvipeve.scienceontheweb.net/jet_jj-6csx_parts.pdfIn PDF document text
    • http://english-10.site/65663073973epucw.pdfIn PDF document text
    • https://mirigemiw.weebly.com/uploads/1/3/4/7/134753474/65831426c.pdfIn PDF document text
    • http://gafuvufafokujop.sportsontheweb.net/whats_the_cheapest_way_to_build_a_tiny_home.pdfIn PDF document text
    • http://choosenews.space/31049948550zijj0.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/sefukirexuwekij/zelawerawuvagax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34995d65-e6e5-4cae-85c8-3d133093d52e/nilexinasinonulamo.pdfIn PDF document text
    • http://sabiwilurase.atwebpages.com/puvufifujegobizidezevuxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41218d98-c44e-4797-84d2-3de54bd9e989/what_is_energy_cold_brew_at_dunkin_donuts.pdfIn PDF document text
    • http://nuridoxiwe.rf.gd/wajetip.pdfIn PDF document text
    • http://zasufogokalo.rf.gd/45278356883.pdfIn PDF document text
    • http://mibaruruluket.rf.gd/74732293133.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1ebe3c8-3dcd-4997-877e-c62104eb7cc2/76756604107.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/95050632959.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/pugavukumewazise.pdfIn PDF document text
    • http://kadizilurojiniz.onlinewebshop.net/ccna_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d09e9928-cadb-4e01-bc18-9853c3e063f1/christopher_paolini_inheritance_cycle_book_5.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_off0000ed59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED59 5836 bytes
SHA-256: b5ec7cb9e7b6ebebb562f161d9ffbb1edeff512e56a8082ca4886000022540cc
font_01_sfnt_off0001011b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011B 10940 bytes
SHA-256: 7b820eb5d83dc00b2ea7d77f365e7bdaa703ed5bb9702e46b3ba887eedea59ec

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