Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9ba4735d1d53a90…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 08:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b0d3c453db1e5e4fc0c6f504f0af2b0f SHA-1: 317f330f7263cc9a59645d783028491369f54ac4 SHA-256: d9ba4735d1d53a909967b95e953a273b95dda52f42677b12262ab3baef8daacb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of an embedded JavaScript stream (T1059.007) strongly suggests that the PDF is designed to execute malicious code, likely to redirect the user to external URLs for phishing or further payload delivery. The numerous external URIs found within the document, many hosted on disposable domains, further support this attack pattern, aligning with a spearphishing attachment (T1566.001) vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://abhimaninteriors.com/ckfinder/userfiles/files/matoturo.pdf In PDF document text
    • http://finproekt-msk.ru/userfiles/file/257804907.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/57205192341.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/29307973918.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/zoliwizavizukojodoxad.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/13541369573.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/97rijk8ehkn6ricqmj1ttb8f5t/75580265682.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210913054428.pdfIn PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/36022324337.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/13706829455.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/40129861413.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/rasibafaruwipewavuw.pdfIn PDF document text
    • http://artemon.nl/userfiles/file/woviwuse.pdfIn PDF document text
    • http://sinoorchids.com/image/file/55003924874.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/20883400882.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140580412afc---93541042970.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/59631132257.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/xiwodijiragabibuzajikatad.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/91695702793.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/46930333993.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/lopuje.pdfIn PDF document text
    • http://integrotech.eu/zdjecia/file/40391388884.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=g+syntax+pubg+apkPDF 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_off0000d80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80A 17944 bytes
SHA-256: b0e6736c33010a9ba73df2de48d615216cc98d49f51c2e411041880f0c113893
font_01_sfnt_off00010680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10680 10524 bytes
SHA-256: b4b67539aa019a6af11b238e45a9557096488e9e1fd7e1de42d85993f69fda89
font_02_sfnt_off00011e79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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