Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c3462ddfde22f6d…

MALICIOUS

PDF

73.4 KB Created: 2021-03-11 01:49:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 67def71e3cecbbe89e14391b590195d2 SHA-1: 3077ca5ab156fd21edb53066dc80f1233c5dac9d SHA-256: 2c3462ddfde22f6d114fde1630b30ce4506bf3738379be19544e89aa5faaaebe
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 0.9989

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/wix?keyword=endocrine+system+webquest+answers PDF link annotation
    • http://losinglotterynumbers.com/wow_rogue_legendary_daggerso1x0w.pdfIn PDF document text
    • https://cdn.sqhk.co/xopuxuvop/vgdjdjj/36663960840.pdfIn PDF document text
    • https://cdn.sqhk.co/nakotuba/hygegPU/vobuve.pdfIn PDF document text
    • https://cdn.sqhk.co/fabokofe/qw7FUjc/zosusofaxofo.pdfIn PDF document text
    • https://cdn.sqhk.co/nuwalimo/Pidjhib/43611974776.pdfIn PDF document text
    • http://babubusawase.22web.org/pakanujufaxewoga.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450347/normal_5feb79909cdd8.pdfIn PDF document text
    • http://podeves.xyz/pipotuxupeludexupixeruxnw0m.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422136/normal_60044d9644201.pdfIn PDF document text
    • https://cdn.sqhk.co/fegukajebaj/ieheOid/lakidutaxexofekabagewugu.pdfIn PDF document text
    • https://cdn.sqhk.co/silutoge/DhhOmCa/netigixulizebif.pdfIn PDF document text
    • https://cdn.sqhk.co/gebunemif/wjjifhf/94505059950.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468553/normal_5fdf5095916ca.pdfIn PDF document text
    • http://quinzsy-studio.design/3365999628478pbl.pdfIn PDF document text
    • https://cdn.sqhk.co/pitewomepe/Fhd8c7h/galaxy_on_fire_2_best_ship_base_game.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462351/normal_5fd05e694cd10.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://9a4203bb-6ff2-4ef1-9c63-3f113f84a884.filesusr.com/ugd/ea9bdf_840f1b577e204d5a8ac79d7bc1ed1da8.pdf?index=trueIn PDF document text
    • http://puwowega.epizy.com/how_to_study_for_acls_course.pdfIn PDF document text
    • https://f8d4b294-f952-4a11-85e8-0a3036f9bdaf.filesusr.com/ugd/ad8f3a_4ada88652ec344f2991d49ee0829e1c6.pdf?index=trueIn PDF document text
    • http://pamakejexo.epizy.com/99541264850.pdfIn PDF document text
    • https://4541bc1c-e35c-4de3-bb44-1f53c3e1a56d.filesusr.com/ugd/68f66e_3e644f8d10c44920afc0a42456034de8.pdf?index=trueIn PDF document text
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_b330cf7acdad484e86089b0eb70b3353.pdf?index=trueIn PDF document text
    • http://jifadeve.rf.gd/tenant_agreement_form_uk.pdfIn PDF document text
    • https://03dfb0eb-7fe6-4188-ad87-ea2b88df7b19.filesusr.com/ugd/f967ac_d78618f47c4f48a7b7af91113f44bf26.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_off0000d5e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E0 5352 bytes
SHA-256: 242ad6ff0bde28b37effed606e29729f6f0f6a1c6c41edf4717d0f2edaf96a96
font_01_sfnt_off0000e805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE805 9888 bytes
SHA-256: 08bc13956c24bbf5facc19389fdcaa02dcb66f4abb5ce898455399ee2a742342
font_02_sfnt_off000109ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EA 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333