Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a28456c7cceed4d…

MALICIOUS

PDF

60.4 KB Created: 2020-11-13 06:17:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c34bdefe5f2fb5b408aa7fadef94c99e SHA-1: 23bd36ff729825dbe9f50087468644e77462c406 SHA-256: 1a28456c7cceed4dc232bfc9edaf99076ed615902c0d53b09de0c585484a6ccf
96 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 external URLs that direct users to attacker-controlled resources. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffe.ru/aws?utm_term=cdc+vis+sheets+influenza PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421767/normal_5f98404be8d06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370078/normal_5f884a343d477.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481671/normal_5fa8e6c85bfb2.pdfIn PDF document text
    • https://lewutiresapilo.weebly.com/uploads/1/3/4/5/134594640/9616887.pdfIn PDF document text
    • https://pixabetamomu.weebly.com/uploads/1/3/1/0/131070001/kuvono.pdfIn PDF document text
    • https://vixeroniwemeful.weebly.com/uploads/1/3/0/7/130740086/9875764.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/8bfb64bb-0c35-44e9-8ac7-53c1d086402b/wafoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f9c2fd2-d66c-4fec-ad7f-f60babbd9285/99906278482.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fe21b59-27ac-40be-9e1f-8a14eac690e8/zugolazemaguwipemomed.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_off0000b2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2EB 5028 bytes
SHA-256: 1eb4bfde92ddaf464dcf6be7b5789c6811059d9662375f15bde130961b15b509
font_01_sfnt_off0000c414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC414 9648 bytes
SHA-256: 0e535e36d3d0612946b7c805ffd66325f87cc5f67213399fb5accb7a144b1b83

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