Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c722a4630c58a59…

MALICIOUS

PDF

79.5 KB Created: 2020-11-11 15:41:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: bde56ff0da6a6d7873bd16bf0d8fb4c1 SHA-1: 5a7c62578f6d243ec1342fd380f1bd80416533e7 SHA-256: 9c722a4630c58a598cc4ff4d84b51a62d91a05ca8457b13d0647ec9cc8c108f3
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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://traffine.ru/strik?utm_term=learn4good+games+strike+force+heroes+3 PDF link annotation
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/zupejomazegizonik.pdfIn PDF document text
    • https://disadaniti.weebly.com/uploads/1/3/4/4/134463451/8735848.pdfIn PDF document text
    • https://xubuvene.weebly.com/uploads/1/3/1/3/131380433/tukonu_xadateriropisa_vizumi_sabasepurolava.pdfIn PDF document text
    • https://wevuviwujito.weebly.com/uploads/1/3/1/6/131636984/lazufal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369138/normal_5f92604f29186.pdfIn PDF document text
    • https://faxilazow.weebly.com/uploads/1/3/4/7/134725206/lupusawedapegozurop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447093/normal_5f9d7981524a8.pdfIn PDF document text
    • https://puwevifu.weebly.com/uploads/1/3/4/4/134465284/2574849.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376879/normal_5f91f87c76a39.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/df731062-6a5c-41d5-a37a-64a7ebf04fac/kaplan_gre_math_workbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c834c403-01f3-43f4-977f-85b18c3eb229/16419258789.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc082a4a-3a39-429e-9573-47fe8c9b02a0/musica_peruana_negra.pdfIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/xizaji.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
    • 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_off0000d1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F9 5660 bytes
SHA-256: 87415280c6b15af443de12e7755f1ac498f75ce25728952c212a9eb46890482f
font_01_sfnt_off0000e524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE524 2904 bytes
SHA-256: a0fe2daada3f9176e98494b10909635b23cf183d11683fbcbfedfb157e9710fb
font_02_sfnt_off0000f119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF119 12460 bytes
SHA-256: 69bd5a33f69f4dfadd853213de7b3d39b6b9e0332d53ee626a7ca9360df86272
font_03_sfnt_off000118bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BC 16208 bytes
SHA-256: 06343eaa619275e1c102bbacd8a35b7a5f581dd9f1c0f4ff537dfc77a6965a95

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