Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fb1444d2245f894…

MALICIOUS

PDF

78.7 KB Created: 2021-05-23 04:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 7db481a6141429e78abf9365248b4a47 SHA-1: c4845055fa49e83a3aff8f8021f618441af8b11d SHA-256: 6fb1444d2245f894f57e8b408561e7b1f04be06aa36e83807ee98a2c4a2c98ad
136 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 by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. A heuristic identified an image lure linking to an SEO redirector, specifically the URL https://kuzutuzo.ru/strik?utm_term=njhs+induction+ceremony+program+template, which is likely used to deliver a malicious payload or conduct phishing. No scripts were extracted, but the PDF structure and embedded URL suggest a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://kuzutuzo.ru/strik?utm_term=njhs+induction+ceremony+program+template PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4482863/normal_5ff41243f0726.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415936/normal_6022b20e66ffa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377931/normal_6038b511c788e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392215/normal_6002d732e2edf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416798/normal_6029871b8b0c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451563/normal_603a159a807a9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443344/normal_5fe28a8a465e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459916/normal_603bc4db923ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408482/normal_60571ffc17d9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481163/normal_6047eb85cf39a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377120/normal_5fe4fdd51ad13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456128/normal_605438707aed8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449965/normal_5fddc52f90bf7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495399/normal_5fd088258f429.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465252/normal_5ff806a89520a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502268/normal_5fda017727f05.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/ba999dea-45be-4178-b725-41cc80520d0a/24387606293.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75f3501e-225d-43ed-bb93-8525358ff262/81884026314.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/234b445b-23f6-428e-8a2b-afc661e45f0f/advanced_origami_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b047a400-3bac-4d4e-a948-4659139434c0/28049520754.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f778a5d3-2078-4594-ac28-38dd4a9aad0f/how_to_get_free_shipping_victoria_secret_canada.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_off0000f41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41F 5636 bytes
SHA-256: 9098a86feb1909c1ea09dea8ebb99d9c0abc3ed2fbb265122632e09328fb9b70
font_01_sfnt_off00010730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10730 11160 bytes
SHA-256: d579594b8d2010b9640d6ca7ab1118e523fb6b696ac1eae4a6656ba223b1160b

Open this report in the interactive analyzer, or submit your own file for analysis.