Malicious PDF — malware analysis report

Static analysis result for SHA-256 e317ef25cea60b4b…

MALICIOUS

PDF

83.2 KB Created: 2021-04-22 20:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: afaa8051269b07d9f0b01db8ba0fca1f SHA-1: 2248a7dc9d3a9d77177d16c3ef3c662de03fbf14 SHA-256: e317ef25cea60b4b079cf13a7c30a94bd5db67004cf2c2c49a36d70afc03486f
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, dafemum.ru, which is a strong indicator of phishing or malware distribution. The document body, though heavily obfuscated, contains text related to 'Chess for dummies board game' and authoring application details, suggesting a lure to disguise the malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

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://dafemum.ru/strik?utm_term=chess+for+dummies+board+game In PDF document text
    • http://itwow.info/the_confidence_gap0wuoz.pdfIn PDF document text
    • http://espaceabonne.com/42702771087xoayc.pdfIn PDF document text
    • http://kudretbozaci.com/27446045564o0k78.pdfIn PDF document text
    • http://simopuvoramawu.mywebcommunity.org/cell_and_molecular_biology_book.pdfIn PDF document text
    • http://xomunuxeju.sportsontheweb.net/20279781994.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gezetega/jameligimarej.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/bloodborne_wiki_guide_ign.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2693d79c-35dd-4834-89c2-cad429b7855e/fiwarolemetogima.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffdf17b7-7ab4-4e8c-95de-44b3cece6e86/98838099972.pdfIn PDF document text
    • https://s3.amazonaws.com/nafamaragisek/ejemplos_de_memorando_en_ingls_y_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4a645ff-6688-4039-a30c-7624f7093786/rineganukonurigaxuba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30c9135b-6c1e-4fb3-bbae-04e69a665810/maths_worksheet_for_kg_class.pdfIn PDF document text
    • http://wukevivetarapu.myartsonline.com/calculus_textbook_finney.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/47225606099.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/burson_audio_soloist_sl_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/best_ab_workout_program.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/zezolidona.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_off0001079d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079D 5336 bytes
SHA-256: 303e3bc49094d402def05a8afc567760abe20060dfe86ab0ea26156fd5fc436d
font_01_sfnt_off0001198f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198F 11408 bytes
SHA-256: a80664fe817b22fabffc5f3a3fb3919b8126c0c9c7a9699d81829d42a99b3464

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