Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c02b5272a24cc15…

MALICIOUS

PDF

72.4 KB Created: 2020-11-13 06:24:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: bf9b63beec828b9920352eb78ea19ba2 SHA-1: bb65af471101c36615c061ca19d927730bc408b1 SHA-256: 1c02b5272a24cc15fced7cca1f98928e2b8eefbf871ba24825cb356747abeca8
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a significant number of external links, with one notable URL being `https://trafficel.ru/123?utm_term=basic+drawing+tutorial+pdf`. The heuristic `PDF_SEO_LINK_FARM` suggests the document is designed to host a large number of external links, likely for malicious purposes such as SEO abuse or redirecting users to further stages of an attack. No scripts were extracted, but the presence of numerous external links points towards a phishing or malicious redirection attack vector.

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://trafficel.ru/123?utm_term=basic+drawing+tutorial+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368235/normal_5f91df4e55fdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454544/normal_5fa2eb0ed7c8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379742/normal_5f992057849d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476938/normal_5fabb3e1ac757.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378836/normal_5f977ed88a2fc.pdfIn PDF document text
    • https://mizitixas.weebly.com/uploads/1/3/4/5/134589849/polopumezajinog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368246/normal_5fa6df891a368.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368741/normal_5f8c0ecf53795.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368781/normal_5f9d35ee8edf9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385012/normal_5f9d5bba4be6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385434/normal_5f97357ca276d.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/4efd7403-6ec9-4122-9247-3d141f0673d7/4491614042.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d1e77d0-e80d-40d2-a6a9-a3bdeaaa064c/yle_starters_worksheets.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_off0000dd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4E 5464 bytes
SHA-256: bdff097f74280f175ce1ac3e88b6df6f0b1f9f2e43e87e0c5f2ee4770996f34b
font_01_sfnt_off0000f009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF009 10420 bytes
SHA-256: 629ab7d876a32bb8425e1ebbd004e91759e74e3c6551534bd935c8ba5e6c4ad7

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