Malicious PDF — malware analysis report

Static analysis result for SHA-256 243520a43cd6dac3…

MALICIOUS

PDF

125.2 KB Created: 2020-11-24 10:11:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: c2e0f3d54a3fc8194c15abd4be4470f3 SHA-1: 6ec52496f1e6b4a029bea39fe7408b57610637df SHA-256: 243520a43cd6dac3e537adaec5137d014f0c796b87698e835f5bc191a0c6d977
214 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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/123?utm_term=2005+kawasaki+mule+610+owner%2527s+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4380523/normal_5f95d9e8378c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375887/normal_5f8d9ba05e50a.pdfIn PDF document text
    • https://jujodupif.weebly.com/uploads/1/3/2/3/132303189/xifagapuj-zopepuvafakupip.pdfIn PDF document text
    • https://tokitowopune.weebly.com/uploads/1/3/4/4/134498993/9791147.pdfIn PDF document text
    • https://fulipevaxavu.weebly.com/uploads/1/3/2/6/132695351/8d82963.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377928/normal_5f9ce8f8c6858.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385427/normal_5f8e084db7377.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/6c5529a2-4f36-4d8b-8c73-a9b6d2071acc/mupupuvinupe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e5f045d-7b59-410a-885f-6227c8089d88/31496665859.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d329ea5f-acfb-4f8b-8a20-ab75a45556e6/96185790283.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_off0001894a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1894A 2888 bytes
SHA-256: 604725ebf9bf0d9ab2bcf42cb3b9eb1946ba017bf99d5c2e6531ff47cfbc4b7a
font_01_sfnt_off0001938d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1938D 5532 bytes
SHA-256: 59fd1a8f24b17903e26701432cb70680357e68962708cc01c9f13830f6aac8d3
font_02_sfnt_off0001a669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A669 12504 bytes
SHA-256: a0eef3dbc43ff1375c9a7ce74f964e0198eac349fae6e42f2d22a7e95a93f7fc
font_03_sfnt_off0001d12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D12B 16280 bytes
SHA-256: 2bdd315d79189c7a589d90255eeb9538df4229af8a07db2940a3c954637bdbc3

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