Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ea1e84ae4196a20…

MALICIOUS

PDF

80.7 KB Created: 2021-03-28 11:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b4937afaec583e727636229af33334df SHA-1: 5ab080bb1dd08e6db68e8bef5bd43943c645ba69 SHA-256: 6ea1e84ae4196a2001ef5d550d6b08ab62d5be465550e9f24236a992820d79da
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 0.9998

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://zajinet.ru/wix?keyword=ap+calculus+bc+1997+multiple+choice+answers PDF link annotation
    • http://wupunekum.getenjoyment.net/caissons_go_rolling_along.pdfIn PDF document text
    • https://fanesorugetefex.weebly.com/uploads/1/3/1/3/131383934/7497451.pdfIn PDF document text
    • https://sefovajeve.weebly.com/uploads/1/3/0/7/130775607/sarumaxesedujilaf.pdfIn PDF document text
    • https://larulukesulugu.weebly.com/uploads/1/3/4/3/134305666/waxigupofixunon.pdfIn PDF document text
    • https://zazobowelukoki.weebly.com/uploads/1/3/0/9/130969428/bigudufevuberopelita.pdfIn PDF document text
    • http://kapubasezo.iblogger.org/axis_mutual_fund_fatca_declaration_form.pdfIn PDF document text
    • https://xukanimuwuvam.weebly.com/uploads/1/3/2/6/132696198/rawozubukejul.pdfIn PDF document text
    • https://sijivijotulexe.weebly.com/uploads/1/3/1/1/131164009/2c9f371b.pdfIn PDF document text
    • http://xapowuxif.mywebcommunity.org/affairscloud_monthly_current_affairs_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bugenerefajujus.atwebpages.com/96451002865.pdfIn PDF document text
    • http://fupisetugib.rf.gd/theorems_of_boolean_algebra_proof.pdfIn PDF document text
    • http://nuluwajewugutik.onlinewebshop.net/bluetooth_low_energy_security.pdfIn PDF document text
    • https://f1cb2ec4-a82d-4768-8a06-5236a2db220e.filesusr.com/ugd/a2e20a_8985efd901e7493f9f3bfe691e6595dd.pdf?index=trueIn PDF document text
    • http://neloralo.myartsonline.com/formulae_and_tables_for_actuarial_exams_2nd_edition.pdfIn PDF document text
    • http://sasaxunofob.atwebpages.com/kamadamir.pdfIn PDF document text
    • http://nakarajibap.myartsonline.com/gakaxe.pdfIn PDF document text
    • https://a29d81ee-e589-4368-99bd-4e0be04eb4c0.filesusr.com/ugd/a89e6e_825facde6b2643dd9a4d4404b17c9ab3.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE469 5680 bytes
SHA-256: c8468fc8c14ac2a3630496e886ffba45cd6e0c5206487df9f7573e49f579f9bb
font_01_sfnt_off0000f7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AC 11872 bytes
SHA-256: 0872338a6060aaaf443d85c74116e206949eba6b71d2144bfceb3a1a5d4f685d
font_02_sfnt_off00011fef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEF 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

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