Malicious PDF — malware analysis report

Static analysis result for SHA-256 375a6cd726b60a49…

MALICIOUS

PDF

71.8 KB Created: 2021-09-26 02:38:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c1a8b1c543f4d184561806909367db91 SHA-1: 381d3c1fee7c7c7eb3ddb9ca7058ce960fd25e02 SHA-256: 375a6cd726b60a493343a43d185df718d2bb41b41b99b8783c77a0b9936cd05e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to disposable domains, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c039d0c04c---35280223775.pdf In PDF document text
    • http://hjhchem.com/upload/files/bekozagubewe.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/fudufirekuputif.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/kimebobaju.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/76748839577.pdfIn PDF document text
    • https://kvizek.hu/ckfinder/userfiles/files/12071299055.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/50053730455.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/mutoxezijasipojaxog.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/suzeda.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/rajad.pdfIn PDF document text
    • http://songdolandmarkcity.com/userfiles/file/zebifipazaz.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/petizobo.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/jipadutizuvivixa.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/7cc19e0a350cfec4937419c61a0dd7c8/boditajuvamabadarusuxo.pdfIn PDF document text
    • http://naturpix.ch/cmsimages/file/ladunapimawuwuxonuka.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sojoparotugoweloru.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/65974806563.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/17610057863.pdfIn PDF document text
    • https://ka-base.no/images_content/file/42319955884.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/vanajubibefirugadiledos.pdfIn PDF document text
    • http://vedepcuaem.com/luutru/files/79602274259.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/55734051940.pdfIn PDF document text
    • http://ranczowdolinie.com/files/56621115780.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=papercraft+skull+pdfPDF 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_off0000b31f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB31F 10488 bytes
SHA-256: 3a6a29f70ad82e495fe6954740f66c6b7070740d1839a763c9ba1da79d70e340
font_01_sfnt_off0000cb2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33E 18060 bytes
SHA-256: dd554ed9a437f5e626b167f6fec2245100fd0b3376919ff53be55a2492320ce0

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