Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdaf36708e7cd119…

MALICIOUS

PDF

80.7 KB Created: 2021-04-07 16:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3f24c0ea905935ed4063b4e71f71cc5f SHA-1: b2e9e2ab366ec5a9f01f67164ea274a22bf97532 SHA-256: bdaf36708e7cd1191460e0c29e96efe8c7c6898f6711cf24d43cc0c4d9a46b30
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://dugedepap.ru/award?keyword=breast+cancer+ribbon+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4425915/normal_601fd1578097d.pdfIn PDF document text
    • http://vizozipemovowe.iblogger.org/radio_pakistan_weather_report.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375509/normal_5fe5c56f4f5b8.pdfIn PDF document text
    • http://jikalananigopun.iblogger.org/8102066138.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376878/normal_6023c201c524a.pdfIn PDF document text
    • http://xutarima.22web.org/breve_historia_del_neoliberalismo_harvey.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379374/normal_6003da61f295a.pdfIn PDF document text
    • http://tevoriveterusof.22web.org/physiotherapy_treatment_of_carpal_tunnel_syndrome.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nonavijewiw.epizy.com/garment_production_process.pdfIn PDF document text
    • http://batevawave.epizy.com/where_are_amana_ranges_made.pdfIn PDF document text
    • http://tokeparab.epizy.com/jugular_foramen_syndrome.pdfIn PDF document text
    • http://kelovikaxovixu.epizy.com/52206412379.pdfIn PDF document text
    • https://356bbf58-84af-4bff-99a9-d03346e46411.filesusr.com/ugd/b5472a_3e6abec11cde417cb4d19715f253f69a.pdf?index=trueIn PDF document text
    • http://waminakukivexo.rf.gd/63341448886.pdfIn PDF document text
    • http://kidereludabiron.epizy.com/full_form_of_ukaa.pdfIn PDF document text
    • https://315736c7-1030-4200-8d24-05c9f4951019.filesusr.com/ugd/d19ca0_d25b9c29afe54798870d86d623576cce.pdf?index=trueIn PDF document text
    • http://dagajunodarekon.epizy.com/kezufepido.pdfIn PDF document text
    • http://sexuduwivaz.rf.gd/98844944989.pdfIn PDF document text
    • http://jupexalamax.epizy.com/solid.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_off0000fe96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE96 5308 bytes
SHA-256: fbc2a3b03bd4824225dd11482cb94d4a84269c2f0c8e8256eb805b392739bff1
font_01_sfnt_off000110aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AA 10896 bytes
SHA-256: bb042da7ab70a6e05d03b83a4007b8eb44a40881a5d6de11b521061b5d31b663

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