Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b0f3639de76dc1c…

MALICIOUS

PDF

71.5 KB Created: 2020-11-19 19:52:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 7a490ce80190968efcc0aa9a8eab307b SHA-1: bcb3898a4269e6a41e8ebd60ece65066f640bbad SHA-256: 8b0f3639de76dc1cbe8f2d83fed454c464f625a67765315f7384818374fb526e
154 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 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 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://ggtraff.ru/strik?utm_term=download+plex.apk+for+oculus+quest In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366655/normal_5f8cf4ca67c39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365998/normal_5fa1b74b9788f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365613/normal_5fb5fb40eaa0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382194/normal_5fa101333b9f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410201/normal_5f9eb595913af.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/d13e952d-3551-4c0f-8c71-7252640f1ccc/7219675364.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc7ea332-b5c0-40d3-b6db-974700c73a22/key_signature_worksheet_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72bad5c9-c9ce-4287-83fd-ab611d0834b0/64797854124.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/lenudufuva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f3b0439-ac7f-4075-94fa-4e8dd2436845/tati_urban_dictionary.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/tijesorosujalifajaji.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/pagup.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/dekisimaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80b8dc4b-1498-4382-9905-846272b720b9/gelelevomed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/233d65fa-1e07-4927-aeb3-12a8845d1c91/zewukaxibukoni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c987e32c-b58f-4167-a8f9-b8f87a2caff5/xitutuzuzexasimo.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_off0000d901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD901 5528 bytes
SHA-256: da00f47f44e3e0d9b0fb942dc2966f04a491ce13e91a36fd0836259c1b14a6f4
font_01_sfnt_off0000ebff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFF 10764 bytes
SHA-256: 55cc78be2807559ee518e6ed8868960a090acb2ccdce1f0d7664515af5ed0ea5

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