Malicious PDF — malware analysis report

Static analysis result for SHA-256 86941ca4ebe88b31…

MALICIOUS

PDF

86.5 KB Created: 2021-03-23 18:33:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 60e38d5bb484c011f46a1e8413b0377a SHA-1: c819a5247589d9442edf198ddb6117bcd20f2887 SHA-256: 86941ca4ebe88b31633bc711598214448d5f41c6912b7693d017617a765f4e70
136 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a high-severity 'Image lure linking to an SEO redirector (free-download phishing)' and a critical ClamAV detection. The embedded URL 'https://gimoguvi.ru/123?utm_term=different+emojis+android+vs+iphone' is identified as the redirector. While no scripts were explicitly extracted, the PDF structure and the nature of the URL suggest it's designed to lure users to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/123?utm_term=different+emojis+android+vs+iphone PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4408478/normal_5ff10e6988617.pdfIn PDF document text
    • https://cdn.sqhk.co/wazafanez/hSjaTha/13359166592.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444882/normal_5fd3233a9fc03.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367019/normal_600816d93cbbf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465938/normal_604b39261c125.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423428/normal_60313385dc07a.pdfIn PDF document text
    • https://cdn.sqhk.co/gipirukanut/exhf6Ej/first_aid_for_burn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387815/normal_5fd1e75600473.pdfIn PDF document text
    • https://cdn.sqhk.co/mumesimasozo/d9jijil/dufat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418565/normal_5fde1fe2abc42.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366402/normal_5feb5ccd089c5.pdfIn PDF document text
    • https://cdn.sqhk.co/kutajanode/U0hjamX/tenirunazefibadevadiko.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375075/normal_5fed496ff17cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488555/normal_5fffb1f2e85fc.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/1a121869-d036-4ef7-9c13-44058aa54a92/91642745762.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82a1c3d0-c00e-4552-9d8a-aac9bff54da5/mind_control_device_nms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/706831a2-e6ca-448d-8607-6f7369c18106/celestron_astromaster_90eq_telescope_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cad3bb8-abb3-4930-a564-0745af20a4a3/nespresso_lattissima_one_manual_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58f6f1cd-e7f7-40f4-9940-9466f362e186/how_to_program_clicker_remote_keypad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9f51ede-4c69-42aa-af92-5d8822e01a71/sabukowikupunifu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60314e70-8154-4cf1-bfed-4e7ff501ff58/zetoxilewuva.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE914 5384 bytes
SHA-256: eb6cdfb90c350a3dab915acf4582969ccde5b9cc9a6af543f6eab7abbdd1ea66
font_01_sfnt_off0000fb42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB42 5720 bytes
SHA-256: 3cd0a4a64bd66432c3b6461dacca3b4a3c6fae3e600e18d94727c0ce882a99d9
font_02_sfnt_off00010fc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC3 11116 bytes
SHA-256: 2c057381698e4340a660acc3df549ae58fecca7bd56a807bad3a7cab5373ef6a
font_03_sfnt_off000135de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135DE 16704 bytes
SHA-256: ef05be79fef0d87c9a123470665ed3028166d368afb55136b91f6a4e4e6145c1