Malicious PDF — malware analysis report

Static analysis result for SHA-256 98b111bc1361c355…

MALICIOUS

PDF

74.2 KB Created: 2021-03-18 03:34:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f7ffb0b7b4113c0563dfaab8d5c11caf SHA-1: 9c58282f022210f4c6fc0d3552147fe42223e017 SHA-256: 98b111bc1361c355e9f79f6bbf27d0babfe043c0082664653b333ac496f0af6a
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 0.9996

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://nipisod.ru/award?keyword=articular+system+pdf PDF link annotation
    • https://cdn.sqhk.co/mepowokugo/OxpieWe/angelo_s_soccer_corner_columbia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483335/normal_604495879b97b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484365/normal_603d3aa676200.pdfIn PDF document text
    • https://cdn.sqhk.co/jisokemefaz/arLsQgj/head_rebels_club_hoodie.pdfIn PDF document text
    • http://tulumiv.medianewsonline.com/72823958386.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488141/normal_6010f1cc69dcd.pdfIn PDF document text
    • http://zimezobot.getenjoyment.net/1987_ferrari_testarossa_specs.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/3e6e933a-feeb-4cff-a97d-5f6555261efe/how_to_tell_if_your_solar_inverter_is_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61e30e60-034f-4a6a-8872-d6f8e7ade231/photoshop_mac_shortcut_change_brush_size.pdfIn PDF document text
    • https://97e6e6c8-040d-427c-ad66-6ef02350ae38.filesusr.com/ugd/9c523c_918a08a31da347668a9e7295431c6bdb.pdf?index=trueIn PDF document text
    • https://6131fb9f-3080-406c-a6ab-c4686b6a2f6f.filesusr.com/ugd/52be6f_c7e663603e614454abcbb91beccdc2f2.pdf?index=trueIn PDF document text
    • http://rosajeku.myartsonline.com/boards_and_beyond_step_1_checklist.pdfIn PDF document text
    • http://ligiwekuxote.myartsonline.com/product_recall_procedure_template_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afb61212-be69-462c-80a2-3468d5b6a0d4/how_to_analyse_information_and_make_a_decision.pdfIn PDF document text
    • https://ee6bc897-aa08-459d-b6e6-b1b1d69fcba1.filesusr.com/ugd/7ba596_73bf0b4ee5584759842904fa368e4760.pdf?index=trueIn PDF document text
    • https://48cc712b-de5e-493e-a198-f8962849e22b.filesusr.com/ugd/d2751c_ed9fdc1a3eb145919aa552355143e171.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/13cbff5f-58c3-471c-a14e-069d79b9376d/94533695199.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7521b2f-1aab-4a08-ad8f-c108eff42a5b/sharp_atomic_clock_model_spc364_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66a21067-b97f-4c2f-8b80-5f55f0749508/98559173601.pdfIn PDF document text
    • https://7a512b58-7189-4bc4-8343-f643fa9054c9.filesusr.com/ugd/1e52da_873021d95a1c4b46827f3664fc5a8b78.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9078272a-e93e-4051-b7d6-c06696cc1bca/what_is_principles_of_design_in_art.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_off0000e5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AF 5392 bytes
SHA-256: 472a2ef500d9a4923d50d1fa16aced2db98de85c74767a0323de895c4b7dce0b
font_01_sfnt_off0000f7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FA 10316 bytes
SHA-256: 4cdbb5b872d2735e3ac44f2167a893d385775b767a2b276f2279e5d1b05166cc

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