Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6c864351484d8a3…

MALICIOUS

PDF

80.6 KB Created: 2021-03-18 10:14:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: dcde2d972106e49bfb789d4980f43d3b SHA-1: 1733df0b44483491b41cf5049331ce7b5064686b SHA-256: d6c864351484d8a369800464441d3948828195b4e930553c4437de6136ae92bb
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 0.9996

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://resalured.ru/wix?keyword=reading+a+metric+ruler+worksheet+pdf PDF link annotation
    • http://leoidet.xyz/west_bend_microwave_em925ajw-p20ohju.pdfIn PDF document text
    • http://alexandreablog.com/60102821280dqwp5.pdfIn PDF document text
    • http://podarokinsta.online/how_to_read_control_panel_wiring_diagram2orff.pdfIn PDF document text
    • http://siteznakomstv69.space/42267383540l6do3.pdfIn PDF document text
    • http://ourfanz.com/mapa_de_riesgo_covid_la_paz_boliviae1go1.pdfIn PDF document text
    • http://zasazigupat.getenjoyment.net/residential_landscape_architecture_6th_edition_free_download.pdfIn PDF document text
    • http://trujillostacoshop.com/apoorva_shastry_microbiology_textbook_downloadvexmv.pdfIn PDF document text
    • https://cdn.sqhk.co/finepawug/gjcgfjh/laxuzowopikizitejuniza.pdfIn PDF document text
    • http://tixshopclub.fun/asbestos_roof_sheet_disposalbdgdr.pdfIn PDF document text
    • http://jekefidaz.mygamesonline.org/jazupujuviwazowib.pdfIn PDF document text
    • https://cdn.sqhk.co/denobafopum/giijial/perodidosaxisezavidodo.pdfIn PDF document text
    • http://prizinsta.info/newtons_first_law_of_motion_formula_and_examplescw6rq.pdfIn PDF document text
    • http://fasad-dom.site/defukifufolugu4bpgs.pdfIn PDF document text
    • https://cdn.sqhk.co/venitalobeni/gjNLugi/warfighting_functions_mission_command.pdfIn PDF document text
    • http://shoop-fp.ru/building_code_evaluation_reportea6hh.pdfIn PDF document text
    • https://cdn.sqhk.co/jojipimuve/d0gjWji/33904071890.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://caf0f927-206f-4b4e-aa34-0dd3da53679b.filesusr.com/ugd/83d902_831de779cbe54c6fbb984b7f76af8da4.pdf?index=trueIn PDF document text
    • https://c8f6a2ed-bc8a-4fd4-b26a-19707db7c4cd.filesusr.com/ugd/1cc7e8_b5a30e7d313549ceb540998a7cce7dc9.pdf?index=trueIn PDF document text
    • http://jokubamobivavum.onlinewebshop.net/53636412780.pdfIn PDF document text
    • https://b6f97e74-198a-461d-a312-d71b9712332b.filesusr.com/ugd/a2d007_d073cb5d4ec3453fab78d2ebbff2d356.pdf?index=trueIn PDF document text
    • https://6a1e2a5f-c456-4288-b9d5-5378f87870fb.filesusr.com/ugd/076fac_36088c177b70437ea8f5566b80c59936.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF451 5732 bytes
SHA-256: 00281fb2d2b5fa84ba45e8df532dc751f1ecb503bccf55a29a614608978e8169
font_01_sfnt_off000107c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C1 2048 bytes
SHA-256: 5bbfb71e7e79db7713d2dca3d61a529cd6bdf2162d19a91745b024a6fee9cfc1
font_02_sfnt_off0001109e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109E 10576 bytes
SHA-256: bedf1703295fc701aa59ed1383b0a77e6847159fa918ff81410b628138c28f6f

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