Malicious PDF — malware analysis report

Static analysis result for SHA-256 5642a744fdc47d6c…

MALICIOUS

PDF

90.9 KB Created: 2021-09-21 03:31:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b7e1764c49c81221585927d0b25aa896 SHA-1: 7aecef746432d9a499a8818d013233c79fa754ed SHA-256: 5642a744fdc47d6c402ac9a74076bd5acb687f332e488e56b3ac1db202b18faf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution intent. It contains numerous embedded URLs pointing to potentially malicious PDF files hosted on various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to obscure the true destination by using link farms on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://elfuklid.cz/foto/Image/file/xufolepiruwagebub.pdf
    • http://evergladesharvesting.com/ckfinder/userfiles/files/papez.pdf
    • http://geojeoceanhotel.com/userfiles/file/20210913023355.pdf
    • http://sun-green.be/ckfinder/userfiles/files/20720624624.pdf
    • http://motovelo-nmsk.ru/userfiles/file/vipupozukegiwijare.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141130687825---7853562187.pdf
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/28413461470.pdf
    • http://azco.friend-match.com/upload/files/80009036019.pdf
    • http://plaschke-partner.com/uploaded/file/59761580600.pdf
    • http://valsadindustries.com/userfiles/file/83963551897.pdf
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/relel.pdf
    • http://wsospice.org/uploads/userfiles/file/file/tetakutoxodoreju.pdf
    • https://johanbjerke.se/userfiles/file/venodem.pdf
    • http://cuspsurgeons.com/userfiles/file/bazoxesutokabaxidi.pdf
    • http://hzzxtl.com/UploadFile/file/20210912184355381.pdf
    • http://posicert.com/upload_fck/file/2021-9-5/20210905135004763264.pdf
    • https://shellserva.nl/docs/Image/file/jukebefefup.pdf
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/lanuwugisezekuzu.pdf
    • http://ymjgolf.com/file_media/file_image/file/lepizaserajogasew.pdf
    • https://coil.hk/upload/files/80468507931.pdf
    • http://tdbm.vn/upload/files/12380804210.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16146a8f1d0c3c---gizogata.pdf
    • https://zaragozadenoche.es/upload/files/zupimaperukigasojoliromim.pdf
    • http://dallapietamarchisio.it/userfiles/files/raxumupimudewakusulufa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=r+meaningful+words
    • 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_off0000fa70.bin
f3b5a50cdbe1685cdb6a0f5a133513eff82a898330af5d91ec9b4c52323740d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA70 10828 bytes
font_01_sfnt_off00011332.bin
4c85cfeea0bf7c6f3b3f3aa145dd6b5c29e7c394b58fc52365e78a6f84cde5a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11332 19664 bytes
font_02_sfnt_off00014652.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14652 16792 bytes

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