Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca8193c727b90a80…

MALICIOUS

PDF

71.5 KB Created: 2021-09-25 05:38:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d3a2d96ffad7bbab9938929b1afeb83d SHA-1: 82e3f1f787508a7f9423aef1d5fffacd99d49456 SHA-256: ca8193c727b90a802c55b4f7272ee584e33b86d191237c8e794c7d096a354604
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a large number of embedded URLs, many of which point to disposable hosting and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=vygotsky%27s+concept+of+zone+of+proximal+development PDF link annotation
    • http://gulfcoastlist.com/userfiles/file/40942673868.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/69862244745.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210924_1164D4DDFFCD3969.pdfIn PDF document text
    • https://inprovitchile.com/ckfinder/userfiles/files/nawiretulebixe.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54359324234.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/nemelatofobusagugiz.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/farifilezabuvozugajugil.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a0033d1aa---94748644591.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132160fb7284---vefitegedigavutalokunos.pdfIn PDF document text
    • http://npas.ru/pic/file/jakadevu.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/42672907490.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/zulunipunekupew.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/rabagowiwizomiweg.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/81705271780.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/sapozeset.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/62206309150.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/28264162062.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1614b3ec989e90---39429106208.pdfIn PDF document text
    • http://polaryachtmanufactory.com/res/wysiwyg/file/vusejupiduzemuzo.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/36277357437.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/76251051911.pdfIn PDF document text
    • https://halkapsikoloji.com/userfiles/file/77035862358.pdfIn PDF document text
    • https://mackbeks.com/files/file/jakixujuna.pdfIn PDF document text
    • https://tour-paris-guide.com/cite_imgs/file/81521799653.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/77690016685.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_off0000b56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB56F 15668 bytes
SHA-256: 09e8579c6e1254f34ce9627f3c53ba632871ee04016da98eb0bd07a9fa22fb37
font_01_sfnt_off0000dced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF504 11400 bytes
SHA-256: 9f25440d064f10de9e2cfe366335da283b2786cb96df926fe09b471d50c26b01