Malicious PDF — malware analysis report

Static analysis result for SHA-256 346a5230a4d77e3d…

MALICIOUS

PDF

99.6 KB Created: 2021-04-03 03:38:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8861ce8c565bf495a72ae50931f19a3f SHA-1: 16a2d64e36d6a8e0ef2acaa6579a1e074e9fc222 SHA-256: 346a5230a4d77e3d9067d627ed9f75365fecc2256d6c3a7dce73f3630bba1a51
186 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 0.9981

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://seumenha.ru/wix?keyword=playster+vs+audible+vs+scribd PDF link annotation
    • http://rasipafus.getenjoyment.net/85569192133.pdfIn PDF document text
    • http://pokovata.scienceontheweb.net/ruxokesiruzamoxulasiju.pdfIn PDF document text
    • http://sopesukenapad.scienceontheweb.net/96783413439.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://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_7d52c427f6134f53918ee40d32a722f2.pdf?index=trueIn PDF document text
    • http://godemesefiw.epizy.com/creative_writing_worksheets_for_grade_4.pdfIn PDF document text
    • http://sobikunukozi.rf.gd/single_stranded_dna_virus.pdfIn PDF document text
    • http://zapofekeba.rf.gd/54511169158.pdfIn PDF document text
    • https://28f2c00a-638b-45ec-8848-4d649cb6aba9.filesusr.com/ugd/946f28_e75f0888f36d4a7980f4e1df85e6fba6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bezorito/first_aid_guide_for_chemical_poisoning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd75f0ae-25a5-4ef2-978a-dbc3cb0d4977/dyson_dc59_battery_reset.pdfIn PDF document text
    • https://441768bb-9839-4df4-8f78-dd1233b527f6.filesusr.com/ugd/7e6080_ed8d682b125c4ac19f8900dc3ac4c8d7.pdf?index=trueIn PDF document text
    • https://ede36962-9452-4451-b182-fa4236ba9bc6.filesusr.com/ugd/83b1b3_33482fbc69194ffc9fdd87f9270701d3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gudukupir/la_hija_del_sastre_book_english_translation.pdfIn PDF document text
    • https://s3.amazonaws.com/poresi/driver_behringer_u-_phoria_umc404hd.pdfIn PDF document text
    • https://294bc5b0-e711-499e-a8e9-8a617bca330d.filesusr.com/ugd/c4f63d_f2512fa4acb74010b55b089923e8dc44.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c3a8374-8556-4527-9466-7383dbd0dd7e/bollinger_on_bollinger_bands_amazon.pdfIn PDF document text
    • https://e6343aec-df69-40e7-9959-3c0c55bf73c9.filesusr.com/ugd/6a9017_22aca0b83820492cbc80b3829b10c751.pdf?index=trueIn PDF document text
    • https://72b50e20-f79f-40ca-96b4-24bef83e308f.filesusr.com/ugd/1a1092_01b38f0f79ec4918baf1f577a0da12ec.pdf?index=trueIn PDF document text
    • https://f11c4bf2-12a6-49f8-9590-07a94b689168.filesusr.com/ugd/11276f_9db44b699d8b4533a75f3b2184011471.pdf?index=trueIn PDF document text
    • http://fozufafetad.epizy.com/20963678348.pdfIn PDF document text
    • https://203e60c5-e32a-4587-ab6d-31d66de6d5b9.filesusr.com/ugd/014c36_ae8ae0a40e30496cb7cd24e20670ff72.pdf?index=trueIn PDF document text
    • http://zirivog.rf.gd/17105409926.pdfIn PDF document text
    • https://b0c090b1-cb02-46d8-8a69-3fb9d82636b6.filesusr.com/ugd/4dbf3f_e3e7da3bbc904926ad38da8435066375.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_off000122b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B0 4904 bytes
SHA-256: 67140c53c96abaf9fb8479114745726bc5e78ca4edefe108d17216996371c8a0
font_01_sfnt_off0001336c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1336C 11632 bytes
SHA-256: 94113750f92ea243186a7715851a835729ca261c3a6074d4d29a11e242c13392
font_02_sfnt_off00015b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B3B 16564 bytes
SHA-256: 3984aaaeede11ed53980bb48206da3b27b6fc51783d4a7b5aa85381c10b62135
font_03_sfnt_off000171dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171DD 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230