Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcdab39429d6f3d0…

MALICIOUS

PDF

82.8 KB Created: 2021-09-10 04:19:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a0159e0524b1283f0bd58272b02bb0e8 SHA-1: ba1b4baf56fe4bfef9702aa5cdf292d6df14f268 SHA-256: bcdab39429d6f3d04a3b1bc4b96d9823e760cc2f85d6266eb3e3e554ad80e72b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a high number of external URIs, many pointing to disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pro-group.ru/userfiles/files/45981924614.pdf In PDF document text
    • http://sun-apartments.pl/data/pages/90248250614.pdfIn PDF document text
    • http://xfswchem.com/upload/files/bakamugusarepepi.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/kenolebubefonelugelefor.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/60446737086.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/66881069501.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/182367530.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138332bbe1a1---91184232762.pdfIn PDF document text
    • http://guowangcable.com/d/files/pinivopovibigubulon.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mozeje.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/38789836092.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/14912390174.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/98998716725.pdfIn PDF document text
    • http://domkomplekt34.ru/attachments/file/jumutologexaja.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/joziwexijunizema.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/30848393011.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/89392686563.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/69749750484.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/43798389451.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16134a91b2d84c---vomepumotalepufupixap.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/63739122335.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/wujoxejoperabobu.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/45588338204.pdfIn PDF document text
    • http://geoman.cz/data/file/bobibowufiseketujiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=when+i+update+my+phonePDF 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_off0000de6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6C 10548 bytes
SHA-256: c6df0ef7b45d1ac125f1d26cf27e883331d12ff6a6de043b7f07fccdbfd09dbf
font_01_sfnt_off0000f64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64C 17856 bytes
SHA-256: ca3952d955ea0793587360a19e6fb4922686bb2e9061798d03cfd18799091016
font_02_sfnt_off0001252e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1