Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0c9abafe56c48c1…

MALICIOUS

PDF

66.3 KB Created: 2021-03-22 03:58:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7ee1147780ec1dd3b11ed1b9db6cae03 SHA-1: 21a5d24e010da4316b47abee2c5205703035af30 SHA-256: d0c9abafe56c48c1a2cd4b08e3e0f77a24397b6dfe185996e0fd6a0b875ca75c
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 0.9997

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://zajinet.ru/wix?keyword=earthcomm+textbook+answers PDF link annotation
    • https://cdn.sqhk.co/vovewotutal/hbihLjg/22450194619.pdfIn PDF document text
    • https://cdn.sqhk.co/baxalelizop/WaidXnr/membranous_labyrinth_anatomy_definition.pdfIn PDF document text
    • http://beduwud.22web.org/what_is_a_bypass_damper_on_a_wood_stove.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497369/normal_5ff5cbf0a8b32.pdfIn PDF document text
    • http://tanubujurutemut.scienceontheweb.net/cigna_international_medical_claim_form.pdfIn PDF document text
    • http://xuroriwonufuz.scienceontheweb.net/63231284741.pdfIn PDF document text
    • http://somixewavado.sportsontheweb.net/john_deere_js63_diagram.pdfIn PDF document text
    • http://vexoxem.scienceontheweb.net/11394302498.pdfIn PDF document text
    • https://cdn.sqhk.co/tavikalamo/mjjjidW/fetawoduv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499351/normal_602e5277ccc99.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493282/normal_6001d93d3d3ef.pdfIn PDF document text
    • http://wukosuwusa.iblogger.org/tigers_in_the_wild_cub_scout_requirements.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411481/normal_5ff170875ca0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402517/normal_6040ab05ab861.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nejokamofa.rf.gd/business_law_exam_1.pdfIn PDF document text
    • http://wetozofuzim.epizy.com/how_did_seal_team_6_get_its_name.pdfIn PDF document text
    • http://tulinavosubod.rf.gd/xaravekigozotexeduso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03a4ccc4-a165-43df-a36c-5a3f6cf29808/what_is_link2cell_bluetooth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a198ff4-90d1-46d5-bb91-0027a6cdbe5d/types_of_writing_purposes.pdfIn PDF document text
    • http://magakawigola.epizy.com/descargar_libro_caballo_de_troya_5_gratis.pdfIn PDF document text
    • http://xekurenu.rf.gd/98308889648.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_off0000c8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B1 5328 bytes
SHA-256: ec9b03451fe0c1a82c40d97a6e713c97caf440c0302415209546992041752903
font_01_sfnt_off0000dab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB9 9816 bytes
SHA-256: 029a4e62bcb44dcfe1e873f35977d82e7927c705870d45e4074ac6e1ee2332bc

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