Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb7e00474c53b54e…

MALICIOUS

PDF

76.4 KB Created: 2020-11-17 01:48:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4ba038a4c812b3791a6141c7bd64bd3b SHA-1: 1b7d8c1bc8270d035c239053667cd999aace14ae SHA-256: cb7e00474c53b54e1dbd04f0cfc530ce56a09b50b95a943ebf3224217fe86758
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffset.ru/strik?utm_term=herbarz+polski+tadeusz+gajl+pdf PDF link annotation
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/ramazadezi.pdfIn PDF document text
    • https://rajerese.weebly.com/uploads/1/3/4/3/134387708/8729926.pdfIn PDF document text
    • https://gatofofuxiwiv.weebly.com/uploads/1/3/4/2/134265530/6e6d33524a1b49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467577/normal_5fa8e0d068923.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388037/normal_5f8d7afb834bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368228/normal_5f87620b944b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485157/normal_5fb02635831e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490736/normal_5fb30dd8dcd8f.pdfIn PDF document text
    • http://www.opentle.orgIn 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/2cfcab55-66f7-4bca-9f56-69d31e565a77/31026703402.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c53fa729-b717-4db3-a10c-0251ea643f81/spectrum_sharing_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba7a2b85-e922-45db-aa89-b5518c10920b/bavixexurezibuxus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1fa34d0-2a14-4b41-bef7-d285057858f5/jomagujexezatijufazu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4c22947-ac19-42b6-b82c-9ea3a9da3309/almost_a_hero_mythical_artifacts.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000d32c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD32C 15180 bytes
SHA-256: 9719604c6eba67d985ee549483c73f8c3d689a2654bd9f8c6c12c128e3b6ad44
font_00_sfnt_off0000c06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC06A 5500 bytes
SHA-256: 034fc2e049437f64ed6181d5ac473d407ff4216d85d94967cbf969ebcf2aace1
font_02_sfnt_off0000fce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE7 11816 bytes
SHA-256: 41173b4dc3b8424dab43072a047b983e7efea9682f7202b14cc68a9aa7f41057

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