Malicious PDF — malware analysis report

Static analysis result for SHA-256 451cd8c7240683e5…

MALICIOUS

PDF

114.8 KB Created: 2021-03-21 12:19:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6b0ab3c0a3a49c20a91686e835b0a2d9 SHA-1: 552c6b67d3e831aa1af0a228d085b5ee96fd6090 SHA-256: 451cd8c7240683e58ec7d2e881468113f41aad708ecd6f0bf82e88af62b0a42f
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 0.9990

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://kuzutuzo.ru/wix?keyword=stellaris+gene+modification+psionic PDF link annotation
    • http://vzale.ru/top_10_launcher_for_android_listbxyzj.pdfIn PDF document text
    • https://boxenujevodaziw.weebly.com/uploads/1/3/1/0/131070305/1992334.pdfIn PDF document text
    • https://feverawujebuv.weebly.com/uploads/1/3/5/3/135314909/7362002.pdfIn PDF document text
    • http://wafolepis.iblogger.org/19653752398.pdfIn PDF document text
    • http://nibodilakiwote.22web.org/can_i_watch_family_feud_online.pdfIn PDF document text
    • http://gesaribenufemi.iblogger.org/voloruxixi.pdfIn PDF document text
    • https://pugufatafa.weebly.com/uploads/1/3/5/9/135967981/gudaramutimu.pdfIn PDF document text
    • https://joxoxego.weebly.com/uploads/1/3/4/6/134664344/nugexuwawe.pdfIn PDF document text
    • https://voresefum.weebly.com/uploads/1/3/0/8/130813922/85e137287.pdfIn PDF document text
    • http://anarchymedya.com/little_prince_book_quoteshy3qc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f19d2187-ce67-4d04-8798-eef694565169.filesusr.com/ugd/bd4746_0e2e9ef5a21d4e28a0dfbd12f98a4b2c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/zexalo.pdfIn PDF document text
    • http://bidexegope.epizy.com/mazezugepaxuwukolosur.pdfIn PDF document text
    • http://rivuwasiwitovud.rf.gd/student_council_speech_examples.pdfIn PDF document text
    • https://a0f88182-e1f9-4a9c-ba22-d5ce004c6985.filesusr.com/ugd/2f3216_26d56760b7934993af26265ba2be119d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/forupokisip/tizibudofenojuwejuxuvim.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/wifajulazorupixejujivob.pdfIn PDF document text
    • http://lepomosafajuki.rf.gd/miwidizujipobewuge.pdfIn PDF document text
    • http://duxupupin.epizy.com/jotekonineg.pdfIn PDF document text
    • http://kuwaxubopuzar.rf.gd/mapa_africa_politico.pdfIn PDF document text
    • http://wotekobadukabuz.rf.gd/how_cold_should_a_fridge_be_uk.pdfIn PDF document text
    • https://bb74f61c-7045-47bf-9a7e-968101ee373e.filesusr.com/ugd/81ef4b_95b5f71befdc4f1d9341d3aa59ed1885.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/voice_effects_app.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/the_anabolic_diet_espaol.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_off0001838e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1838E 5580 bytes
SHA-256: fc11c0206245d65b9cfb4ed1580b9cbbf4bc1e0d23eb2e0cec0d3483773c0410
font_01_sfnt_off0001966f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1966F 11256 bytes
SHA-256: e849de7289d7c6b84bf34e1746a0d0c0aa4769f4d19bb4fdb2cff6c3dafc41ec

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