Malicious PDF — malware analysis report

Static analysis result for SHA-256 c927183771d50038…

MALICIOUS

PDF

70.5 KB Created: 2020-11-18 16:57:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 843a0668ee7e0d91078eb561f1779566 SHA-1: 15ca7ea01b071bbe7e195016c164e7087cf889b4 SHA-256: c927183771d500384886a349eefbb5a190cc47b13b06eb8d95fafd6b256e7216
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 0.9997

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://traffking.ru/123?utm_term=ninja+turtles+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369788/normal_5fab950ce904a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464542/normal_5fadf8fa605c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367303/normal_5f87c50a5ae03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423137/normal_5fa7a2e621879.pdfIn PDF document text
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/mojuduliwefagud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388062/normal_5f907708ed9bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384167/normal_5f9f1cdf4f8e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499329/normal_5fb0297bbb929.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/3e1942fe-e2f6-4b0a-8a5b-9acc2efa3817/wobixikebexanevofaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d415d30c-ccef-4fdd-9d8f-b2f8075bba0f/sawedafal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23313e43-ea75-4d3a-b174-1e6d160d7c9f/vegovopagi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c6ef821-33c1-4df3-b948-d556cd05d1fe/46874824407.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC30F 4920 bytes
SHA-256: 89c46f00f6aa0ba94b66e7ea24ea426734393c3d88d78300a637238c080d65c7
font_01_sfnt_off0000d3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E5 10536 bytes
SHA-256: fc39099e5085921f89d0020256b03567c79e55ff7723ba5e810bcbd777fb31aa
font_02_sfnt_off0000f831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF831 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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