Malicious PDF — malware analysis report

Static analysis result for SHA-256 8095d63b734d358b…

MALICIOUS

PDF

78.4 KB Created: 2021-05-26 02:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 49f379e422b879c0ffb5fb0b09391101 SHA-1: 8930d973e123aeeb78cb185aae258565ce689d92 SHA-256: 8095d63b734d358bede7de18c1fae1314924f888f48694633e17412bcf426a27
136 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a phishing lure, specifically using an image to redirect users to an external URL. The embedded URL, https://kuzutuzo.ru/strik?utm_term=how+to+play+donkey+kong+64, is identified as a redirector likely used for phishing. ClamAV also detected this file as Pdf.Phishing.Trojan.

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=how+to+play+donkey+kong+64 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4499300/normal_60335055628b3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460688/normal_5fcbd6c3597ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467926/normal_6015f2f95be6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482847/normal_600c0601f05b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368971/normal_600ad6f93e157.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368999/normal_6032d9964dee4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376359/normal_6051e9984f9cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495841/normal_5feb1e12f299b.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/827b580e-eeab-4234-a5a2-d1793a2d7f65/47233065486.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f522cf8f-fe50-47bf-8645-24c24f8a1e97/16228252902.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a709fce6-7e30-4013-b500-0594150ae155/22158058394.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33252927-e62c-487b-9010-9317e76afd44/13535352231.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6055aec-2bfa-4c9a-a540-9a4182eac2b5/sofoturerelapikanasenose.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a56ef90b-7b48-4fe3-9ca0-7cdc0223e3ae/habib_bank_challan_form_free_download_punjab_university.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3ce31fe-9e9a-43f3-a749-20e0ea3389ed/latirunalu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb3cd9c6-cb15-4ba0-86f1-0defe0b2178b/56075835303.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5a3eeb5-7189-4174-8ff5-c8179d8beed0/xalol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19e1769c-e7db-4962-8ab7-5c54db05e027/program_xfinity_voice_remote_30_second_skip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4bb8412-f5a8-4c79-aa8b-567bafc796c1/how_to_create_a_macro_in_excel_for_dummies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ff42160-6a8c-4c7f-97f8-cc435a5bb958/77879064270.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/160529d4-ba37-42f6-9c18-05f814b29fad/22258093571.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_off0000f369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF369 5316 bytes
SHA-256: c4cc41ed38af020a36a635285aa17acafc0f35bddb1c567ed82b298a1b04a839
font_01_sfnt_off000105b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B2 11752 bytes
SHA-256: 586196f7ee1273de5440253888330efa075eed991226c9a161dfbea4d524a54a