Malicious PDF — malware analysis report

Static analysis result for SHA-256 15539a99d8e448a2…

MALICIOUS

PDF

65.8 KB Created: 2020-11-13 22:34:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 6a56d25b2055a59d1dea76713d75a245 SHA-1: 935723ec5db56b284874a1a2209dfb8985fbfb31 SHA-256: 15539a99d8e448a2abb19ef6cd7e05ce4c865056b9aa43fc9a27bbb3961c2a6d
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 0.9998

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=maine+coon+kittens+available+new+jersey In PDF document text
    • https://cdn-cms.f-static.net/uploads/4412413/normal_5f945019345c9.pdfIn PDF document text
    • https://wozijasobinela.weebly.com/uploads/1/3/4/4/134445001/21a559862b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404123/normal_5faaea80706df.pdfIn PDF document text
    • https://pejopazuzaguwoz.weebly.com/uploads/1/3/2/8/132815183/f5e09a731.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zuxadol/alain_badiou_livros.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/fake_abortion_receipt_copy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a102687-f81a-4f9f-ac57-5ccb4d191b11/bobokosuwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/585c0b84-20de-4d2f-8ded-1186fa7b831f/escala_de_grannum.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/barn_burning_william_faulkner_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8945e94a-f507-44d4-9c16-14b43e824f8f/87869628850.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c33b33c2-1320-4ea9-a5fb-26730ce5b7db/55008835460.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3CF 5332 bytes
SHA-256: 6bec3b406446ee4a5b9c388a29a38951e29b58db3b2532c9dfd3bcd7cd51143b
font_01_sfnt_off0000d62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62E 10832 bytes
SHA-256: 8aca620c0ad5bd8a21b9d2a01a45eae48b0e0e59b2ea6361c59a27b384011a91

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