Malicious PDF — malware analysis report

Static analysis result for SHA-256 279dbfe4b41ea6b2…

MALICIOUS

PDF

85.2 KB Created: 2021-03-30 02:27:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f596c0f24ad80f3a5f9e96959ca50d0b SHA-1: 9887b84337d32396c960362072ff14c13dc65930 SHA-256: 279dbfe4b41ea6b2d5464475a85933b7e97ce6f4a991fbc7b0911a0b37ccb053
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://lozipotod.ru/123?utm_term=aws+s3+bucket++file+python PDF link annotation
    • http://samo-katim.ru/xumidixf8oz.pdfIn PDF document text
    • http://circus.market/wemosuneliwojozosuvunemagb1btp.pdfIn PDF document text
    • http://d2-club.ru/874102845113v49d.pdfIn PDF document text
    • http://cmbmarketing.agency/what_are_your_short_and_long_term_goals_examplesbfs8e.pdfIn PDF document text
    • http://volosaty100.xyz/75309476169h828a.pdfIn PDF document text
    • http://totalcreditreport.info/confidentiality_agreement_template_freeygrhv.pdfIn PDF document text
    • http://reduslimitalia.site/para_q_sirve_el_zinc_en_nuestro_cuerpoaq0a3.pdfIn PDF document text
    • http://retibojebefav.22web.org/vetikadedepevomozugite.pdfIn PDF document text
    • http://selectgetc.top/jefiduvubepflu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/banula/lakasukivavevuguvutefeme.pdfIn PDF document text
    • http://dulefuzobov.rf.gd/72680056905.pdfIn PDF document text
    • https://s3.amazonaws.com/vawoginele/vozitixotojoxesomato.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/2014_cadillac_xts_luxury_owner_s_manual.pdfIn PDF document text
    • http://wotituxisu.rf.gd/dreikurs_classroom_management_theory.pdfIn PDF document text
    • http://gugefojekasarul.epizy.com/betisidelivibowigokut.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/95087883539.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/albany_molecular_research_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/kifodigosagefowagavebawu.pdfIn PDF document text
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_3caa78da11914ed18e928e26be53f3ca.pdf?index=trueIn PDF document text
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_aea3406adf354d11806314b2027129b7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/legipalofi/67480619419.pdfIn PDF document text
    • https://s3.amazonaws.com/doxifuba/ethernet_patch_cable_colour_codes.pdfIn PDF document text
    • https://%s.s3.amazonaws.com/%sIn 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_off00010b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B68 5348 bytes
SHA-256: 9730dd099fb0f85e3139bc2c9e448e8ad50643dd30971fefe37888b1c64efb67
font_01_sfnt_off00011dc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC1 12280 bytes
SHA-256: 5f58b7f5c5636f16f785ee9dfd8a21564e595a3924226249f8c7da0207b18374

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