Malicious PDF — malware analysis report

Static analysis result for SHA-256 90797dca6338b796…

MALICIOUS

PDF

83.4 KB Created: 2021-09-13 11:28:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1846e2fd723710b5afceff54bbf316b3 SHA-1: e18e96f400fb09bcfd4b98eab246a2d5cc574809 SHA-256: 90797dca6338b796077575ed16da78eefde4723115d62f7e2d6490d402112b80
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs, one of which is a direct link to a file with a UTM term suggesting a download lure for a VPN or proxy. The ML classifier and ClamAV detection strongly indicate malicious intent, likely a phishing or trojan delivery mechanism. The document body is heavily obfuscated, preventing a clear understanding of its specific content, but the presence of numerous links and the overall heuristic profile point to a malicious download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ketchas.ru/uplcv?utm_term=download+vpn+proxy+master+free
    • https://inprovitchile.com/ckfinder/userfiles/files/52634301942.pdf
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/52594861655.pdf
    • https://alharithiforcameras.com/ckfinder/userfiles/files/fozinekasapukovowul.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb84ec428e---97258529223.pdf
    • https://pyccenter.com/images/Upload/file/badadida.pdf
    • https://www.hsbofmn.com/ckfinder/userfiles/files/39049532231.pdf
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/luvonuxatat.pdf
    • http://senvietsystem.com/ckeditor/upload/files/33085257884.pdf
    • http://aviatechinform.ru/sadm_files/57922953256.pdf
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/59210089676.pdf
    • http://amy-tsai.com/images_express/userfiles/files/rezixekefarawefiviboropo.pdf
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/87819278693.pdf
    • http://caudafotografia.com/userfiles/files/gozelubemadolod.pdf
    • https://12shio1.com/contents/files/7408824255.pdf
    • http://king-tableware.com/uploads/files/202109130254548258.pdf
    • https://acryl-bg.com/userfiles/file/70199267497.pdf
    • http://suamayin.biz/userfiles/file/bixuruvozaguken.pdf
    • https://umiyawoodworks.com/fckdb/userfiles/file/35492922506.pdf
    • http://greenglobepms.com/uploads/toraxiro.pdf
    • https://maggievanostrand.com/uploads/media/file/fowosusomipu.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344890999c7---40356218523.pdf
    • http://kartywspomnien.pl/uploads/assets/file/sarazuvewovepi.pdf
    • https://autoroman-service.ro/imagini_ws/84306257346.pdf
    • 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_off0000dff6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF6 16792 bytes
font_01_sfnt_off0000f80d.bin
8a83b1a12b83dacd97c2e0ff407a8f1af209cc1978bbf69a3644ee3ad490185e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF80D 10936 bytes
font_02_sfnt_off00011182.bin
f064ec0bcf38a6e30e659a5e9b4ebbc4ecd7cf289685e93eedba2e2db1948949		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11182 17752 bytes

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