Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5bdc7dee50fd2c6…

MALICIOUS

PDF

79.2 KB Created: 2021-09-21 09:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 686b73393c20a5b40b244021bc0e2797 SHA-1: 39d4c1caae96991e44497966d55ba4bcd3e49bc1 SHA-256: e5bdc7dee50fd2c6363fe5960fc62b88eaefacf03e02498c32a40abe0d339aaa
146 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one directly pointing to an IP address, indicating a phishing or redirection attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document is part of a link farm designed to host further malicious content. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://imobilestore.de/userfiles/file/korajenutonupemu.pdf In PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318fc4ab00f---xepegilozusijazeladib.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/kelubaxuxudufuzasubopo.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613da87ede2b3---rasopebenik.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/1978106919.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/mijukunesozoperemesezod.pdfIn PDF document text
    • http://rrmkaryacollege.org/rrmkarya/userfiles/file/fugata.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/53135251297.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/nupowabeboga.pdfIn PDF document text
    • https://campermagazine.tv/public/file/28959902910.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/48050064388.pdfPDF link annotation
    • http://lab4050.com/upload/editor/file/visedinirezidu.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/pozurug.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/muleworofelupemakase.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/xetodamupasijilega.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/94276849727.pdfIn PDF document text
    • https://lompatjauh.com/contents/files/59483904658.pdfIn PDF document text
    • https://susta.vn/userfiles/file/87115181073.pdfIn PDF document text
    • http://garderoba.sk/images/_file/64645525016.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/fututevipiwegibedabisoma.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/saredotam.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/rakarira.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/teremaxudoxezo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+enter+boot+menu+androidPDF 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_off0000d24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA60 17344 bytes
SHA-256: 7ac8b4785a1fb60b5ddafcfabed01f01068933b23e5dd3a5ba18409ad3ea849f
font_02_sfnt_off00011718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11718 10512 bytes
SHA-256: c2092781ac7f4e1c98a3c39908d2e78b11b4870d645cc842d4b043d542c83fff