Malicious PDF — malware analysis report

Static analysis result for SHA-256 17b0d928a2670ff3…

MALICIOUS

PDF

76.7 KB Created: 2021-03-14 05:25:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6d84f43edec3e9e0c5eeb12c728fe025 SHA-1: f88aebeaf11ec2295f23e16cb3f6addfa82ac211 SHA-256: 17b0d928a2670ff3c75fd6a89520e1b961b20f0f8213bacaf78f3da296ed38ab
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 0.9996

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://vilenefex.ru/award?keyword=food+list+for+diabetics+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4487005/normal_6038fc340d9a4.pdfIn PDF document text
    • http://epaytds.xyz/arihant_ethics_book_free_download8iyb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454277/normal_60184f81d19f5.pdfIn PDF document text
    • https://gufekesunix.weebly.com/uploads/1/3/4/8/134888283/tazakotejonub.pdfIn PDF document text
    • http://realwockyc.info/mechanical_engineering_technician_jobs_in_canada_for_fresherske4yl.pdfIn PDF document text
    • http://batmbatm.ru/13596423562e520m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459624/normal_602e548b661a0.pdfIn PDF document text
    • http://trysucre.pro/informe_justificado_amparo_indirecto_ejemploj7rt3.pdfIn PDF document text
    • https://dubudodokaz.weebly.com/uploads/1/3/4/8/134863478/5107069.pdfIn PDF document text
    • http://shtangelkipokupkiitd.online/fefunisadepelijevzxjx5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469852/normal_6047047d65943.pdfIn PDF document text
    • https://divupamafotot.weebly.com/uploads/1/3/0/7/130739309/5116141.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459774/normal_5fde79c239568.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370294/normal_604684f0d0d81.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366662/normal_5ffbbae7d0f87.pdfIn PDF document text
    • http://qwonder.space/334270942824azav.pdfIn PDF document text
    • http://glawerry.online/how_long_does_beef_jerky_take_in_dehydratorcgafq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7915398d-c9c2-4241-abdb-40cf742e4b8d.filesusr.com/ugd/d4df0f_9f7307bb948e49009fdce41ad956216d.pdf?index=trueIn PDF document text
    • https://52c77544-2eb8-427c-ad0e-a8a7e2ea9366.filesusr.com/ugd/93288f_6f104ba2e2714116b6aaff2a2b98e11e.pdf?index=trueIn PDF document text
    • https://9eff4bf0-55a5-42b9-a65a-250f23c32afd.filesusr.com/ugd/80978b_fead6bed75524254b0bd507db27b30df.pdf?index=trueIn PDF document text
    • https://5862e4ea-63a6-4c92-af93-e06d02d1a664.filesusr.com/ugd/eaa371_1cadc3be40ee41cdbe084b4d2f630a62.pdf?index=trueIn PDF document text
    • https://b2bd4247-5771-4f9a-9f3f-b46500bff287.filesusr.com/ugd/f41bfe_76a3272c1b494758ae829d1b83684514.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5A 5244 bytes
SHA-256: 6b4c9edf26fd04cb020457b71416a89cf9874a331e1916b4ffab68fb5607ace5
font_01_sfnt_off0000ff38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF38 10816 bytes
SHA-256: a2a1c4e61fbe2c1424784a042bac3971cccf834d0622902c28086931efb67f9f