Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d813a444c9f2936…

MALICIOUS

PDF

67.5 KB Created: 2021-03-19 17:44:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 54a2008231c51519b4fafb9707947a8f SHA-1: 15377e5b0ab0c8849bcc24bbd8cfb37f6f809e30 SHA-256: 0d813a444c9f293635afe08ec6c8cc172f4b02f5b520528ecd415fd12ec86860
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

Heuristics 6

  • 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.
  • 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://crophysi.ru/wix?keyword=limit+problems+worksheet PDF link annotation
    • https://vigodozoxofi.weebly.com/uploads/1/3/4/5/134599787/xobifetu.pdfIn PDF document text
    • http://nelawetazabuta.66ghz.com/imagery_worksheet_for_middle_school.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476590/normal_5fdb0fa2d4492.pdfIn PDF document text
    • https://vegimeva.weebly.com/uploads/1/3/1/3/131380995/nubun_worol_zojuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367650/normal_604151d90897a.pdfIn PDF document text
    • https://satobolusiv.weebly.com/uploads/1/3/1/3/131398412/xodelu_fenodumudura_gaduviz_jamalefijut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383321/normal_5ff65406d6a03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406464/normal_5fe891d16e6d7.pdfIn PDF document text
    • http://dofoten.22web.org/what_are_the_advantages_of_solar_thermal_energy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://loxeputogojew.rf.gd/12774508869.pdfIn PDF document text
    • https://1682489e-d94b-4f22-b6a6-c8ecb623ca2e.filesusr.com/ugd/5f226e_2c69414d927649d7bab6bd3667813a2e.pdf?index=trueIn PDF document text
    • https://bcbc83ff-a82b-4234-bf1d-c69e8cae54d5.filesusr.com/ugd/057c82_2b9d42d25f85401eaf6daaa6cc8e02a7.pdf?index=trueIn PDF document text
    • http://zujawuka.epizy.com/adb_install_apk_install_parse_failed_no_certificates.pdfIn PDF document text
    • http://dudaturid.rf.gd/batiwogupa.pdfIn PDF document text
    • http://vaxomuterok.epizy.com/20811088367.pdfIn PDF document text
    • http://tovezujatim.rf.gd/graphical_description_of_uniformly_accelerated_motion.pdfIn PDF document text
    • http://segoxegigo.epizy.com/jotixobesekisevite.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_off0000ccdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCDF 5084 bytes
SHA-256: 5b1ac90affc95a510c04dabb8eec2f26d3f08456b7e024fe57f7c408a108bde9
font_01_sfnt_off0000de0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0E 10180 bytes
SHA-256: 6be377289597c7a7be0eb9480d4fd19b710b557983bf6b02adbf4d99988df296

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