Malicious PDF — malware analysis report

Static analysis result for SHA-256 e208c68ec04652db…

MALICIOUS

PDF

77.2 KB Created: 2021-02-21 20:59:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: cfca663ad671fe805a94f760e6070f9b SHA-1: d606064523a383bc3212757c401ea6eff87f27e2 SHA-256: e208c68ec04652db80b17079f3a7c00f55742b8c64559d9181ee62eecbfef6a0
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains a malicious redirector link disguised as a browser update lure. The embedded link, https://yafferge.ru/strik?utm_term=rt-ac66u_b1+router+login, is flagged as malicious and likely leads to a phishing page or malware download. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a phishing or trojan delivery mechanism.

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
  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://yafferge.ru/strik?utm_term=rt-ac66u_b1+router+login In PDF document text
    • https://cdn.sqhk.co/xovikojux/IaUiiAs/rebels_and_redcoats_huntington_wv.pdfIn PDF document text
    • https://cdn.sqhk.co/waxolulum/SghU8if/abalone_shells_for_sale_wholesale.pdfIn PDF document text
    • http://kevumoler.22web.org/52475543040.pdfIn PDF document text
    • https://cdn.sqhk.co/jivaduzar/lgjIgdh/kogama_parkour_easy_medium_hard.pdfIn PDF document text
    • http://vesefotaso.iblogger.org/delhi_belly_movie_hd.pdfIn PDF document text
    • https://cdn.sqhk.co/fosojatesog/gziduhh/retroarch_roms_pack_download.pdfIn PDF document text
    • http://getizibibi.22web.org/cursive_writing_sentence_worksheets.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/novifamigot/zezenosovasugewibi.pdfIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/diccionario_biblico_griego_espaol_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/22245865996.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/44670829001.pdfIn PDF document text
    • http://bedozep.rf.gd/shadowrun_6th_world_character_creation.pdfIn PDF document text
    • http://jexamovofu.epizy.com/ashampoo_burning_studio_19_key.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE175 5084 bytes
SHA-256: 75c538d0d36c73869f5bd5182f4afd90e97c49a19851818aba7eb862f61e63e5
font_01_sfnt_off0000f2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E3 11376 bytes
SHA-256: 7a661887f1a3bdc95f6f6b178836eb90e6d8faeb150a7176c5051b79f552a3c2
font_02_sfnt_off00011991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11991 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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