Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3819b161fe2f67e…

MALICIOUS

PDF

75.7 KB Created: 2021-04-18 04:33:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 0c3abbf06aa8172dac43aa6ddd3e3d86 SHA-1: 17bbf9cbee85a0b6a7b4ab46da44d256a4038604 SHA-256: f3819b161fe2f67e9a5e8c5b181449395f46fef6575dcedd386f72bac9ee90b3
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 0.9991

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://jumiwimov.ru/strik?utm_term=english+speaking+app+ios PDF link annotation
    • http://gukevipagopu.mywebcommunity.org/rukedusu.pdfIn PDF document text
    • http://tejasatobes.medianewsonline.com/woxerotajexiserumepusa.pdfIn PDF document text
    • https://cdn.sqhk.co/kososojog/jeVBVhy/oconee_station_state_park_sc.pdfIn PDF document text
    • http://itdiscounts.pro/sidasirukodaffkwl.pdfIn PDF document text
    • https://cdn.sqhk.co/leperanurosi/gfQjjhi/94757057991.pdfIn PDF document text
    • http://gosepakaf.getenjoyment.net/21620588868.pdfIn PDF document text
    • http://proita.space/wovibuzomabauxq1z.pdfIn PDF document text
    • https://cdn.sqhk.co/zexoribuj/Tdgjjha/transmission_fluid_change_cost_near_me.pdfIn PDF document text
    • http://soul-felt.com/59230354638mny25.pdfIn PDF document text
    • http://fapseo.ru/basic_english_grammar_in_hindi_tenses_bookdchve.pdfIn PDF document text
    • http://timelessdecorum.com/nafimokeronagacot2o.pdfIn PDF document text
    • https://cdn.sqhk.co/jumosanex/jgfidg8/54871172471.pdfIn PDF document text
    • http://pochta-24.cc/bajowezowomexnhjpf.pdfIn PDF document text
    • https://cdn.sqhk.co/bikuloxisage/emhhjcn/unchained_melody_sheet_music_with_lyrics.pdfIn PDF document text
    • http://xiviwuk.iblogger.org/30840936674.pdfIn PDF document text
    • http://itdiscounts.info/lajavufotivox6c30.pdfIn PDF document text
    • http://hdsamara.ru/963266894731r74y.pdfIn PDF document text
    • http://hook-up.fun/28253361122l7ngz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lugotafuxiguteg.epizy.com/mudaxapilarefutozobokeb.pdfIn PDF document text
    • https://c36efdde-2309-4ce2-a10d-b6df2ce12cd8.filesusr.com/ugd/e98059_97f6e26069d44ec58772e9cfdf5d1c3b.pdf?index=trueIn PDF document text
    • https://54570836-76ea-4100-b78f-d1ba4c3cc0d1.filesusr.com/ugd/21ac59_505f39a8124742d3bafa56c7efd59ace.pdf?index=trueIn PDF document text
    • https://6776ac3f-883f-499f-bc52-38dff818ec46.filesusr.com/ugd/969751_26b9d77bd61e4622b779f913ef0d9403.pdf?index=trueIn PDF document text
    • https://c3373aeb-ed74-4f2d-b631-fa679e0a3f6f.filesusr.com/ugd/cbe7f7_c29cbb39556f4139aeb4ae0fe179620d.pdf?index=trueIn PDF document text
    • http://fajamoluw.epizy.com/ei_reporting_service_contact.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_off0000ec8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8B 5004 bytes
SHA-256: 7d970a8abc73bc1b129168dfeeb29dddd37c6b088abedaf04a24e77bc865cbc0
font_01_sfnt_off0000fd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD98 10500 bytes
SHA-256: 05f480ef388791421f7f90516b24b400decfd8f7e889a31ca93ed6d70788c178

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