Malicious PDF — malware analysis report

Static analysis result for SHA-256 5751f9aae317d692…

MALICIOUS

PDF

123.9 KB Created: 2021-03-29 05:35:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2909f66a92bdcdf43e74939a1317970f SHA-1: 59a550a6d977c83c10c0e49b9699fe7a7dab13bd SHA-256: 5751f9aae317d692c0e446e7b5fa09de9fd234de10cb79323a60fe332bff7ce6
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 0.9995

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://dafemum.ru/award?keyword=basic+chemistry+vocabulary+pdf PDF link annotation
    • https://cdn.sqhk.co/pemenixa/ahdihjg/89441883999.pdfIn PDF document text
    • https://cdn.sqhk.co/wozejodes/hWcdifd/healthy_vegan_snacks_recipes.pdfIn PDF document text
    • http://microbestdigitalmeter.xyz/intermec_pm43_parts_list93z02.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378152/normal_60076e44a0c1e.pdfIn PDF document text
    • https://bujubupe.weebly.com/uploads/1/3/1/4/131437121/nojaxixom.pdfIn PDF document text
    • http://kanshoper.site/87118572982ecn5o.pdfIn PDF document text
    • http://samokex.sportsontheweb.net/audi_a3_price_list_2020.pdfIn PDF document text
    • http://wikotimu.scienceontheweb.net/torupisi.pdfIn PDF document text
    • https://cdn.sqhk.co/bexutavukaro/ifnjfgc/free_one_page_business_plan_template_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/marixefe/cNz9gew/sorosesasuli.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417419/normal_6032c6951e892.pdfIn PDF document text
    • http://lupelisizi.medianewsonline.com/9312687904.pdfIn PDF document text
    • https://bixarina.weebly.com/uploads/1/3/1/0/131069915/6b5c86.pdfIn PDF document text
    • https://nelemiken.weebly.com/uploads/1/3/4/7/134704654/tekivagava.pdfIn PDF document text
    • https://fujazilumekopel.weebly.com/uploads/1/3/2/6/132681311/3668613.pdfIn PDF document text
    • http://just-gopro.com/pojenasakomekikonarelineg7oas.pdfIn PDF document text
    • http://cmbmarketing.agency/35107641948rfs67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458827/normal_603b8682f094e.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/28e7f160-7506-466b-82bc-63421f6b08ea/goronabetogobaxi.pdfIn PDF document text
    • http://vebagakid.onlinewebshop.net/valazejototeralene.pdfIn PDF document text
    • http://xinifaduzinuvu.onlinewebshop.net/how_to_update_adobe_photoshop_elements_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61a666f1-f760-4946-bbcc-359e298a4382/serinenimoriji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76d28616-15e8-4ff5-a768-764e7f38c71f/text_to_image_converter_ai.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61daf68a-32d2-475c-97dd-863d00f2039a/glencoe_geometry_chapter_8_study_guide_and_review_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8633d5fb-f598-4734-8cca-3eae21f4cd55/how_to_adjust_carburetor_on_mtd_lawn_mower.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_off0001a67e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A67E 5744 bytes
SHA-256: ae00bdc31b2a053079d6c837fdaf511a488f779f74209b3e7d9e0801a97072f8
font_01_sfnt_off0001b9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B9E5 11800 bytes
SHA-256: 552eeb8a06909b724bb310e9aa6f764bdf75fdbe40252c05409cde8f932fc590

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