Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f386784a3272536…

MALICIOUS

PDF

100.9 KB Created: 2021-03-12 07:37:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 7bd216a0e562d14a4a0af623dd7591bb SHA-1: d1cd5b89841187d5d42597d184987e8bbafead31 SHA-256: 0f386784a3272536778759d0bcc9ba4fed62204a2a0568024d6ae689fad6dc01
244 Risk Score

Malware Insights

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

The sample is a PDF document that contains a large number of embedded links, many of which point to disposable hosting or redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The embedded links are designed to lead users to potentially malicious sites, as evidenced by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://dafemum.ru/award?keyword=alfa+romeo+giulietta+specifications+pdf In PDF document text
    • https://sunakolezapomuj.weebly.com/uploads/1/3/4/6/134698053/48156c004.pdfIn PDF document text
    • http://bavewemelemare.iblogger.org/amaravati_kathalu_satyam_sankaramanchi_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/zumiredosuwi/hchdohf/67270163135.pdfIn PDF document text
    • http://kakerusejom.iblogger.org/18056797528.pdfIn PDF document text
    • https://ripapexogona.weebly.com/uploads/1/3/0/8/130874469/fipaweku.pdfIn PDF document text
    • https://cdn.sqhk.co/xovujiroveg/fwdIjaM/52046741822.pdfIn PDF document text
    • https://dapasubasawesol.weebly.com/uploads/1/3/4/3/134383907/3905716.pdfIn PDF document text
    • https://cdn.sqhk.co/revipidamog/VduCbSM/81736161888.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zebofazedixa.rf.gd/pumufixipuk.pdfIn PDF document text
    • http://wasuragexoledar.epizy.com/rounding_decimals_worksheets_for_grade_5.pdfIn PDF document text
    • http://rawarawoxegig.epizy.com/adobe_premiere_pro_cc_title_templates_free.pdfIn PDF document text
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_c24054b81f0a4763a69c1510dc1c3396.pdf?index=trueIn PDF document text
    • https://d73c234d-0e3d-497d-8108-d5659bace061.filesusr.com/ugd/58a813_280845423e1e4417b6595844ad208ee0.pdf?index=trueIn PDF document text
    • http://ninonasoligu.rf.gd/22171448758.pdfIn PDF document text
    • https://53ebb62d-ddaf-432f-8dc3-1f4746653467.filesusr.com/ugd/bbd3cf_e797698d404f4b948f7191960b0b40ec.pdf?index=trueIn PDF document text
    • http://mozogovasopuj.epizy.com/arborist_tree_report_cost.pdfIn PDF document text
    • https://8d5bcf17-53f2-4f21-b585-7a27aef14131.filesusr.com/ugd/7baf93_0dd2808c38d2491c89e1bccc97cbe108.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001209c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209C 4280 bytes
SHA-256: 934286399dcbfc45dff4bcd8a4ab37fb2851b13cbd7fc58b61d551308079ced2
font_01_sfnt_off00012fa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA7 5464 bytes
SHA-256: 87357c9a166bc0efd3db9ea66f6a184691e9869c3a0a9c3c4238a170ff5d608e
font_02_sfnt_off0001422a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1422A 14940 bytes
SHA-256: 70f941ddbc18e7fa1cd646c4d86fd6294bc8e52db4bd756e48593121957d0686
font_03_sfnt_off000170c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170C8 16088 bytes
SHA-256: 019e92530604f520106ad5c4b76966f1dd6ed19205c931d1b65f84b35f1178c0