Malicious PDF — malware analysis report

Static analysis result for SHA-256 e71422c756130ee6…

MALICIOUS

PDF

71.1 KB Created: 2021-09-25 11:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 08ed1341d25b703b72717539638fe096 SHA-1: 48b9fc4db51c58332d839737a3f10b5558982477 SHA-256: e71422c756130ee6980a5b6875840f5e235c7993a3b7271f6629554e116e857a
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it is used to redirect users to potentially malicious sites. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware distribution campaigns.

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 http://aumnat2car.com/ckfinder/core/connector/php/upload/files/kugefotilejededobezabimek.pdf
    • http://zygzak.eu/foto_dane/wysiwyg/File/67578275203.pdf
    • https://prtl.pl/userfiles/file/kujafapigojezudu.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/e57e8f570c79c6d08f04a90874ce4128/sirasubalema.pdf
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80048915823.pdf
    • https://polandpools.com/contents/files/gotelukexurasexaritowe.pdf
    • http://volkshilfe-vlbg.at/images/content/files/mezopowakuvijum.pdf
    • https://bya-ingenieria.com/ckfinder/userfiles/files/zitomexiwopenurotepuxukog.pdf
    • https://beamstraffic.com/amb/userfiles/file/87001619047.pdf
    • http://registermycompany.in/admin/userfiles/file/wowikujitajogisikob.pdf
    • http://imhome-listings.com/userfiles/files/67117364614.pdf
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/sirajizutawavoxo.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16134233c897cc---31346547987.pdf
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/26762630044.pdf
    • https://strechybenesov.cz/content/53331665002.pdf
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/jolixovugutesose.pdf
    • https://vinadesigndanang.vn/uploads/image/files/7904160344.pdf
    • http://haitrungkim.vn/uploads/userfiles/file/xogaginojexanepew.pdf
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/zemejijefe.pdf
    • https://zd-zeta.com/uploads/files/202109080244235362.pdf
    • http://www.fonfe.com/uploads/files/pufinunakotuwedanabu.pdf
    • http://htwy.com/upload/file/sebila.pdf
    • https://gujaratisamajparis.org/upload/files/xirulixegegusewovafapim.pdf
    • http://www.beverburcht.nl/upload/files/86372470842.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=upcoming+fps+games+for+android
    • 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_off0000b406.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB406 16792 bytes
font_01_sfnt_off0000cc1d.bin
d1e83218d345d30b7703ac27e564b64da49c188e2b723a806f336ad984f8bca0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1D 10828 bytes
font_02_sfnt_off0000e4d1.bin
46754e2d997b6a44c232a2c11782ede0dc5ffb9c7700b38c941f28834a8baee8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D1 16464 bytes

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