Malicious PDF — malware analysis report

Static analysis result for SHA-256 65efb7c424e8b1e3…

MALICIOUS

PDF

84.8 KB Created: 2021-05-01 15:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a2584317ec08d85030ffb03279ac7753 SHA-1: ade24feb36d26d765b530b09399d65bc2b3ac8d0 SHA-256: 65efb7c424e8b1e3e07168d782de43d9e2c80e352a7a4d1ffac08c08c0db96b3
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://xajibur.ru/strik?utm_term=what+is+cyber+security+starting+salary PDF link annotation
    • http://lumobumekola.getenjoyment.net/sp_blends_worksheets.pdfIn PDF document text
    • http://lafutib.sportsontheweb.net/cleaning_service_agreement_template.pdfIn PDF document text
    • http://saduzemed.mypressonline.com/anemia_aplastica_pediatria.pdfIn PDF document text
    • https://temazojirilezin.weebly.com/uploads/1/3/2/3/132302863/1090080.pdfIn PDF document text
    • http://freshmind.net/rinnai_gas_log_heater_operating_instructionskgsz0.pdfIn PDF document text
    • https://limisakaxenit.weebly.com/uploads/1/3/4/3/134371081/e2e3a.pdfIn PDF document text
    • http://dkblogin-de.com/99005685126gc1ty.pdfIn PDF document text
    • http://pankreatitum.ru/30434979055n05y2.pdfIn PDF document text
    • http://luxuwum.mypressonline.com/sociological_perspective_on_culture.pdfIn PDF document text
    • http://stepka2016.xyz/2_nephi_27_meaning2mrny.pdfIn PDF document text
    • http://jekenufakewe.mypressonline.com/common_idioms_and_phrases.pdfIn PDF document text
    • https://vebazefi.weebly.com/uploads/1/3/4/0/134040586/1f571566.pdfIn PDF document text
    • http://nuloriwilorij.scienceontheweb.net/what_is_happy_endings.pdfIn PDF document text
    • http://shoop-fm.ru/751667464030t9e5.pdfIn PDF document text
    • https://wasinipexo.weebly.com/uploads/1/3/4/3/134362371/d6895c.pdfIn PDF document text
    • http://gikafowezogupij.mywebcommunity.org/jirekiwogenege.pdfIn PDF document text
    • http://zugobopepoj.sportsontheweb.net/voltage_divider_example_problems.pdfIn PDF document text
    • http://alkim.xyz/yearly_planner_template_excelh0asm.pdfIn PDF document text
    • http://allfreebets.ru/butterfingers_1._2_milligrams_albumq6yq9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://ff19a39e-637c-4fc6-80cc-750024e8dd37.filesusr.com/ugd/d217e2_ba927394f0734eed9216ffabef62ba36.pdf?index=trueIn PDF document text
    • http://lofunadex.myartsonline.com/cessna_208_caravan_pilot_operating_handbook.pdfIn PDF document text
    • http://buwifojozoziden.atwebpages.com/what_is_bacteriophage.pdfIn PDF document text
    • https://dce09894-55e7-49e1-9c43-b94069c58f23.filesusr.com/ugd/11ae40_546bf654669e4046b6b55bd10fedea74.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_off00010216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10216 5088 bytes
SHA-256: a1a85ec3ccc01c0cb2601b4b1f96374303303beb1617c5a4043a21f95e533425
font_01_sfnt_off00011367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11367 10432 bytes
SHA-256: 67d35fabd9c1a82e82ab0bfc8716d2be4d4233c99b25c7f161fef5e979dd57dd
font_02_sfnt_off00013722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13722 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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