Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f2fdf36dba68816…

MALICIOUS

PDF

84.1 KB Created: 2021-03-18 20:25:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b56bffd6551462dc66240823920798a SHA-1: dd12780b216e68bcf54a952bf6b06216513b3a72 SHA-256: 4f2fdf36dba68816d6b2f82e6dbc518913e1008b2f880662e2a7f864cda10429
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that masquerades as a 'Pocket guide to APA style 6th ed'. This URL, https://kuzutuzo.ru/wix?keyword=pocket+guide+to+apa+style+6th+ed, is likely used to redirect the user to a malicious site. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URI suggest a common pattern for delivering secondary payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=pocket+guide+to+apa+style+6th+ed
    • http://1xbet-regi.site/apa_annotated_bibliography_format_templateo5sla.pdf
    • https://cdn.sqhk.co/setuboluraje/he6ijjh/42957356247.pdf
    • http://formblckr1.xyz/66574197677wwpec.pdf
    • http://vnds-v.website/stock_watson_4th_edition469sx.pdf
    • http://legiontry.online/84887494658mvwdu.pdf
    • https://cdn.sqhk.co/bonirixa/iidggid/joresedugowaziv.pdf
    • http://idealica-columbia.site/tipotafebotuxurubikaidu.pdf
    • http://opros.xyz/78351250885p3ljj.pdf
    • https://faliroralomi.weebly.com/uploads/1/3/0/8/130874474/xirusokiwos-nubib.pdf
    • http://indir-kazan.com/can_you_legally_hunt_an_elephants7u9p.pdf
    • https://cdn.sqhk.co/jekurona/fhjven6/fozebufixexaw.pdf
    • https://pekubitox.weebly.com/uploads/1/3/4/4/134477952/8cb8c2e4de4404b.pdf
    • http://organicnu.info/94198509536ef8jy.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://nefaped.epizy.com/94811621141.pdf
    • http://wiximevisek.epizy.com/pixelmon_technic_launcher.pdf
    • http://dejudunobagozut.epizy.com/badmashiyaan_songs_ming.pdf
    • http://mirokuf.rf.gd/61057588115.pdf
    • http://wogosozado.rf.gd/wakovogolawenilutozixovas.pdf
    • http://xupiwepe.epizy.com/virginia_woolf_poems.pdf
    • http://virilos.epizy.com/93430147272.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6e0.bin
5c873954be28cd16bc15dd4f986423234cb7ec80cc51c880083f7cba63e95556		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E0 5336 bytes
font_01_sfnt_off0000f91d.bin
09625dec83f6ed46252af93a8f6a5cec722d41aa7cdf3711211711210c684b40		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF91D 11176 bytes
font_02_sfnt_off00011f45.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F45 16204 bytes
font_03_sfnt_off00013472.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13472 4324 bytes

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