Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea067d99b3564b4a…

MALICIOUS

PDF

68.8 KB Created: 2021-09-26 07:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9917536c127f76c1ce56b3080348fcda SHA-1: bf9eb7627951e6e450ddaf76d3abf17d60765316 SHA-256: ea067d99b3564b4a1de7ad2b2addf37c33ba4315c78db1c3460aa44133aff94d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded links pointing to other PDF files hosted on various domains, suggesting a link farm or distribution network. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic specifically highlights the suspicious nature of these links and hosting patterns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://jmvlpslimited.com/ci/userfiles/files/86669026376.pdf
    • https://bahceneryaman.net/public/content-images/files/zirodetokudu.pdf
    • https://karate2.cdmedia.pl/userfiles/file/mozunusixopubu.pdf
    • https://www.ocnistudio.cz/ckfinder/userfiles/files/60621272201.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613108159a14d---voxov.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dc133e39d4---82811023769.pdf
    • http://kcpsystem.com/userData/board/file/17518271086.pdf
    • http://gmkms.net/upfile_editor/2021/files/rupoxot.pdf
    • https://robertbah.si/files/file/17705587291.pdf
    • https://beldapromosyon.com/calisma2/files/uploads/wilunebiro.pdf
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/29465794680.pdf
    • http://inarchengineering.it/userfiles/files/kinusosiwase.pdf
    • https://auto-rujo.com/images-editor/file/5245786482.pdf
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zinanaberedewusekurefotov.pdf
    • http://cualuoiskydoor.com/webroot/img/files/46072415766.pdf
    • https://georeno.ca/userfiles/files/82054459711.pdf
    • https://pinkrali.com/calisma2/files/uploads/84867550212.pdf
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/24815056524.pdf
    • http://ajisushionline.com/uploads/files/managup.pdf
    • http://gamebonda.com/ckupload/files/sojivuzizuzawe.pdf
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/dogizumesokixenagorekinul.pdf
    • http://savitaco.com/uploads/images/files/25720439333.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=browser+video+download+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b089.bin
503023c08455f2c0db7c88b4e4448235260fee2c15c2ec913fe8445beb05a296
pdf-font-stream PDF embedded font (sfnt) at offset 0xB089 14568 bytes
font_01_sfnt_off0000d530.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD530 16792 bytes
font_02_sfnt_off0000ed47.bin
b447539e99245fb0fbb847738ba0d626ed130a3b5f4aa973d432c9a454d30a4e
pdf-font-stream PDF embedded font (sfnt) at offset 0xED47 10584 bytes