Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eb09a14d5920dbd…

MALICIOUS

PDF

228.8 KB Created: 2021-03-22 13:01:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 29582a64132375a158e436183789f8c2 SHA-1: d3e901c6b403029f900d0143bc1a33a4d476d30f SHA-256: 9eb09a14d5920dbdef09485af5655456b3feecb84dab780e5cfcfb926886aa90
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains an external URI and a redirector link pointing to 'https://zajinet.ru/strik?utm_term=richard+iii+shakespeare+pdf+english', which is associated with a 'free-download phishing' lure. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the overall context points to a phishing attempt to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://zajinet.ru/strik?utm_term=richard+iii+shakespeare+pdf+english PDF link annotation
    • https://cdn.sqhk.co/gutifusuf/9tjbF15/fudetuvewoxejuzixabamaf.pdfIn PDF document text
    • https://cdn.sqhk.co/fegukajebaj/hjjMI2a/99169092690.pdfIn PDF document text
    • https://roboxojepuz.weebly.com/uploads/1/3/4/2/134235986/7f554c.pdfIn PDF document text
    • https://kopuzivepepojom.weebly.com/uploads/1/3/4/3/134330145/3294038.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/d9384c88-3539-4afc-9652-8890e50a58a8/komibava.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20087300-512b-4ab7-bfcd-bbcd15574e17/tozizabawatetejebadib.pdfIn PDF document text
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_df2b0d3bd4bf4caf95c61012f65f10bc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa9aeba2-320b-42fc-8949-babfb1445171/xagozaxatovupazi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b4c9eb6-2f7f-4960-bcd9-1dae41deefbb/turn_the_ship_around_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d53bfcc-c97c-41d1-8643-ce9ee3a0910b/maths_entrance_exam_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e507e398-267c-475b-b263-22962eeb5c2d/guxozapukipuwidupepo.pdfIn PDF document text
    • https://37523d11-79cf-4eb3-ada4-f05de57c71ee.filesusr.com/ugd/275374_62b1243b670348e79838b38182c65604.pdf?index=trueIn PDF document text
    • https://71347f20-8353-4153-bebc-dd2a28b3a5cf.filesusr.com/ugd/a382ee_eec1c591402540a8b7dc0c44344fb22b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c2a3cd7-1c9e-40fc-a6ce-ad8b164c5a26/what_is_the_newest_edition_of_dd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68068080-4de6-4b8b-a164-fc1bcf4bd7af/57132941036.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_off00035079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35079 5488 bytes
SHA-256: 780683581ecf973d3c478ffd1651ad04aaedbb504e20d9ed997a0a281c3beb13
font_01_sfnt_off00036326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x36326 10152 bytes
SHA-256: c04fad34b95c8f8ffa1a0cf0feb10ab41d988bef5ca88fa2e5bf9a9673d49741

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