Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b15f22293b25868…

MALICIOUS

PDF

74.6 KB Created: 2021-09-19 15:11:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: feff51517838abc8acf1b14ccfe1722d SHA-1: 72d8ceb04e4e82563b6f3d22f66de8d558763e53 SHA-256: 3b15f22293b25868226eeca66ee609af806c3c6dd631031d550decd15a54883a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains a large number of embedded URLs, many of which are hosted on disposable domains, indicating a link farm or phishing lure. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=justice+league+snyder+cut+full+movie+online PDF link annotation
    • http://zoo-foto.cz/userfiles/file/wobofuxawozenaneduvetav.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/74263509554.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/bekuf.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/gozulebofuraduxaliragupe.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/dumemu.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/sevibefuroxixi.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/bababaginogigodadosaboxaj.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/fexekikusa.pdfIn PDF document text
    • https://sua.vn/uploads/userfiles/file/dorusavurebike.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210905_060511_6903.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/kimofopemozudu.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/vunuvojaw.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/xowaduw.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/79a963fc24a781020d97c81505a748b0/botovegujituvikuguferas.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/99071597978.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/27694925836.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/13071797015.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/20252936170.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/niwomok.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/ketipatitipuzagixikukotu.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614032f3dbd40---87949079717.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/matelixizexirixer.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/zofasogelixexikitejof.pdfIn PDF document text
    • 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_off0000b611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB611 19740 bytes
SHA-256: 709ea741c1f368bc5d3a5dcaa7d26a25d16ad62e2134485c600b0a3ae0244b21
font_01_sfnt_off0000ea99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B0 11092 bytes
SHA-256: 387f06056bdf739641502f5c559a8e40c6b8cc5c34125c25b380572864d46c74