Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7a6df138aa1b41d…

MALICIOUS

PDF

85.7 KB Created: 2021-03-14 18:44:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 24de4fb8beba008dfca6d6b7449cce9a SHA-1: 12faec5693282cc719c122d6ba8fe76e1a1d7ad9 SHA-256: e7a6df138aa1b41d9f35f07d6da910b23e41ae8a2ab5b869201a34a927c18b11
156 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 0.9998

Heuristics 5

  • 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.
  • 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://druttle.ru/wix?keyword=duck+life+2+hooda+math PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4375698/normal_5fc6669c5ace6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471230/normal_5ffff6cbddfb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427523/normal_6035a4ffb3327.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495251/normal_5ffe48be47f54.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425009/normal_5ffd81caadacc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488137/normal_6036e2a23a25f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473384/normal_5ff9027776ccb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://13a7c488-548c-4b48-b567-d2b0b9a3e1de.filesusr.com/ugd/85d67f_3edc31e514e34ee49a7d3044661c94f4.pdf?index=trueIn PDF document text
    • https://1d812fcc-cfc3-4558-a870-56fc5b7f4c2e.filesusr.com/ugd/754d94_5d0bdb6d169c4aff82099bb7cc543106.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab2e63e3-7577-44b3-b695-ccb17abe708f/95411437087.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06ac72be-34a4-46bc-8d63-592650072f5f/katha_upanishad_in_gujarati.pdfIn PDF document text
    • https://c84ffda1-e72a-45fa-8ce8-a771970cf326.filesusr.com/ugd/9fd656_9f59fbf1debf4a1fbfd4f5691c4a02e5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d3f8bfd-33e8-43c8-b947-156fb300580b/maths_formulas_and_tricks_for_competitive_exams.pdfIn PDF document text
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_39af5a60fe554e94a5bd8f391f85b7e7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fc315a8-0f08-41e2-8974-b317b54ed315/26548577062.pdfIn PDF document text
    • https://d5e9a058-cbdc-4968-ba72-30cdbf1e36a3.filesusr.com/ugd/9cfd0a_5d4c8f0adf1d452ab2940b391931a673.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c1788ff-8881-4afc-b423-d9a79badc13a/77202218575.pdfIn PDF document text
    • https://f98f40d2-b649-4e6b-99af-b89bbf2331ff.filesusr.com/ugd/724bd4_9cc5fea43a734a4981a5fff3c6656958.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_off0000f25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25F 5180 bytes
SHA-256: ce4ab2f3f2e8626f1c1526e69660e8c0165ec1b824bfc6ae108427382ea7bd76
font_01_sfnt_off000103e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E7 13152 bytes
SHA-256: e542455cd382cb503e284f010984d535919dd1f863592be57ee149cdb2dffed5
font_02_sfnt_off00012da9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA9 17384 bytes
SHA-256: 529c0782d36fea6c20af2936705234bb59f590e45b2ee45d435f5b5449f93362

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