Malicious PDF — malware analysis report

Static analysis result for SHA-256 950f2dea35f6989c…

MALICIOUS

PDF

73.9 KB Created: 2021-09-25 01:30:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a59d750dd3310b132a09047914262cbf SHA-1: 2238e26c852b16f8caf283a1770e99e1e56cabcb SHA-256: 950f2dea35f6989c8e4dad741b72353cf088a2cff6c2d1f2c44072f20f016774
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file with embedded JavaScript, flagged by ML classifiers and ClamAV as malicious. It also exhibits characteristics of a link farm, containing numerous URLs pointing to potentially malicious content. The presence of JavaScript indicates an attempt to execute code, likely to download further payloads or redirect the user to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad2706aaa5---88665012507.pdf In PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/39566912414.pdfIn PDF document text
    • https://artenika.pl/fck/file/buwuzosos.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/85533946648.pdfIn PDF document text
    • http://czyxchem.com/upload/files/63413448036.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/29015433046.pdfIn PDF document text
    • http://fikszo-whc.com/userfiles/files/10778939347.pdfIn PDF document text
    • https://oasis-travel.ro/files/79056208102.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/61982396643.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210922100852.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/xeduredasutiwexa.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/zudurajunosurexadukibava.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/35664344127.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/61793368113.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/69047455237.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/38587447192.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/40231706709.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/fawelojipaxi.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/39101444283.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/wimelerisi.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161459b69c412c---xojonasasaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=come+installare+giochi+android+su+pcPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB814 11092 bytes
SHA-256: 73f3feb040a0f860aa9bc310070b10cfd356921f864459d31f6f40f06ad25a89
font_01_sfnt_off0000d18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e99f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99F 18912 bytes
SHA-256: 4a0cdd730cc45add01a94f9caaf82ea9959120dc19b4b48730a994697c74df31

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