Malicious PDF — malware analysis report

Static analysis result for SHA-256 11c5763a5982f300…

MALICIOUS

PDF

74.2 KB Created: 2021-04-05 08:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 472ec8e2ed363dab9cf9e0c81a66fbea SHA-1: 8d323ed2fafc26067d77dd929fff3683136c11a2 SHA-256: 11c5763a5982f300ea7479ac6b8c7a083d0696b4c2e2a1fe1b4ef16b79463bd6
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://botokaw.ru/aws?utm_term=what+are+the+techniques+of+testing+listening PDF link annotation
    • http://diporesorojina.scienceontheweb.net/causas_de_vejiga_neurogenica.pdfIn PDF document text
    • http://jagidevivuvu.22web.org/23451757696.pdfIn PDF document text
    • https://cdn.sqhk.co/xilelawemu/jgCfiax/62025864643.pdfIn PDF document text
    • http://wopexobow.mywebcommunity.org/28010846360.pdfIn PDF document text
    • http://tamakedesununod.mywebcommunity.org/construction_of_biogas_plant.pdfIn PDF document text
    • http://maxirem.mygamesonline.org/how_the_grinch_stole_christmas_words_to_songs.pdfIn PDF document text
    • http://losopefopamusoz.sportsontheweb.net/60276705975.pdfIn PDF document text
    • http://tejafosiko.iblogger.org/burger_king_whopper_nutrition_facts_canada.pdfIn PDF document text
    • http://ravevuzovije.mywebcommunity.org/rulopowijazegazumobo.pdfIn PDF document text
    • https://cdn.sqhk.co/towevefizub/iiIjhPW/32158548229.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://giruwixavitunav.epizy.com/zubunesepajopivavorekon.pdfIn PDF document text
    • http://kofaxafogi.myartsonline.com/10402460457.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10cfcea8-9c55-4f11-804d-76658fce436c/4_types_of_microorganisms_and_examples.pdfIn PDF document text
    • http://fazovalekotevo.onlinewebshop.net/how_to_calculate_density_given_pressure_and_temperature.pdfIn PDF document text
    • http://veruzixiki.rf.gd/49149170806.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3442038b-c183-4da9-8b87-b6b4a56b1817/what_is_godaddy_web_hosting_services.pdfIn PDF document text
    • https://87b84290-c0b3-4c73-97a1-3d59c64c3f69.filesusr.com/ugd/c638b7_fe37798b49cd4b3fad3a6624f1cae5d6.pdf?index=trueIn PDF document text
    • https://b5f169ef-6bcf-4d19-a24b-32bdc9dd7a5f.filesusr.com/ugd/2e79a6_164df6bd9ea34ee097d5297cd0f9a066.pdf?index=trueIn PDF document text
    • https://02314edc-d025-420b-9d62-795437f25c47.filesusr.com/ugd/4f0fc1_bf6644d084254735badb47460a1fa873.pdf?index=trueIn 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_off0000e62a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62A 5280 bytes
SHA-256: 19f6f8835d3d8321d65d182fe1b17b1929e36cfba2c749c7abbcf866d722bdb2
font_01_sfnt_off0000f82b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82B 10312 bytes
SHA-256: 575dffa8e2f81f2b0ef726fb992cff6863bb163325a8f6db71902f2cd8477a28

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