Malicious PDF — malware analysis report

Static analysis result for SHA-256 b54166e933cb9540…

MALICIOUS

PDF

76.7 KB Created: 2021-04-11 06:32:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: eacbcd650a370b84fc034e8fa1edbd54 SHA-1: df753fd8776702f8a1936d0c07dd6933acba4c87 SHA-256: b54166e933cb9540f01db3a0b6e0a3c7e13bf212b55df024d60423ce0394908a
126 Risk Score

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 0.9993

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://seumenha.ru/strik?utm_term=how+to+answer+conflict+resolution+in+an+interview PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403561/normal_606035f6388f5.pdfIn PDF document text
    • https://pebepatesova.weebly.com/uploads/1/3/4/4/134447190/7338785.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481400/normal_5fceda3027d8e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384325/normal_5fca8e4b4764e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530868/normal_5fd678a836ead.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366660/normal_6025f6ce0d584.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387813/normal_5fdc2e4364d90.pdfIn PDF document text
    • https://xatoxelal.weebly.com/uploads/1/3/1/4/131482937/tirewovakogaso.pdfIn PDF document text
    • https://tipuzivi.weebly.com/uploads/1/3/0/9/130969377/6938181.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446158/normal_5fdb71d165eeb.pdfIn PDF document text
    • http://sivolejujivozul.scienceontheweb.net/controller_ipega_pg_9023.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481847/normal_5fdddf27688cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453901/normal_60362664756ce.pdfIn PDF document text
    • https://pawiwojofidinof.weebly.com/uploads/1/3/4/4/134458390/xubumeze.pdfIn PDF document text
    • http://vevebopawo.mywebcommunity.org/bertrand_russell_value_of_philosophy.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/0c774570-a02a-4700-b814-9f0bf23fedfb/42009599909.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6373c91-a744-4ec4-b52f-cae7692d9d40/zolomisukenetafixizobimup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90969187-c726-4d7c-9ac8-a6c9f405aaa1/8417672612.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6a5f922-b41a-42b9-b717-4713145c91e7/el_ser_y_la_nada_sinopsis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab0f2e19-8de8-47d1-90b2-b7c6bc831c5d/81005505768.pdfIn PDF document text
    • http://fidegaf.atwebpages.com/animal_farm_chapter_9_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5fc8359-bb5f-4abc-a9ec-7417e72752ea/wukup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6145b72-f417-491b-ae7e-0bc1548a2b56/nursing_care_plans_book_10th_edition.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_off0000ef0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0D 4988 bytes
SHA-256: f4ddaf598aca73c66022878a094332d9cc032a718b80c658d7f1108ad58e385e
font_01_sfnt_off0001002e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002E 10844 bytes
SHA-256: 45de4d00a6df77ba86fee74b004c48fc7c919940ca85ec4fa7304d14b1c459fa