Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fb0cee3108745a5…

MALICIOUS

PDF

83.7 KB Created: 2021-09-17 06:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 10c9baac4d4fc36480468f98d1511062 SHA-1: 3e17f1b8d1993cad18bc76c8a84a9116a3836d15 SHA-256: 2fb0cee3108745a50eaa953729af0e67b545fee9a929ad56f393daa4c07360e0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating a phishing or malware distribution attempt. ClamAV detection and ML classification further support the malicious nature of the file, suggesting it is a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crewmak.ru/uplcv?utm_term=final+fantasy+vi+android+free PDF link annotation
    • http://hiniceshine.com/upload/93230641085.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/18399864830.pdfIn PDF document text
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/41159054842.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/xaxawaxedisiviligodumod.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/jegoso.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/zarolasikiwuxatenugu.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/8199326438.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/javigetexek.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/48423462650.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/30767672166.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/53616804856.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/jibubagizazuputu.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/69161121161.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/77942020878.pdfIn PDF document text
    • http://ke-sen.com/userfiles/file/1630909792.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/15142702329.pdfIn PDF document text
    • https://nyig.com/files/file/tufikuzusawumifa.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/27121228347.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/perez.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/wokadifuwof.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1d24d4c59---kixonukulonij.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/morixelomasi.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/xuwamonisigi.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/32245495653.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161347e38e8f6b---86983361472.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_off0000e234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE234 18108 bytes
SHA-256: 98281740369a79563edeaaad043e90a2438fe04e80387b172a05d648efbd0bee
font_01_sfnt_off00011104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11104 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001291b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1291B 10504 bytes
SHA-256: 070445e4cf1e8f51b22e52ba769876754a27293090775d610f6cdacf17de8657