Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ca5d8936356fa15…

MALICIOUS

PDF

87.0 KB Created: 2021-09-14 04:16:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 08cfbe9749b64b2755f5703148955f60 SHA-1: 08bc8cc1349b8cc53533033c6cacf321aa90d92a SHA-256: 8ca5d8936356fa15922ad4216638b98c6300135480e4233c5c58e315d64733be
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to distribute malware via the linked PDFs. The presence of urgency and download button lures further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/luvetatonana.pdf In PDF document text
    • http://quocteanviet.com/img-chamthi/files/fuluxujeli.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/75593675303.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/jabujek.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/62525935048.pdfIn PDF document text
    • http://koddous.com/userfiles/file/bifutevarij.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/79877218541.pdfIn PDF document text
    • http://erictex.com/ufiles/files/burevep.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/161322dd63826c---vibuxinageburoxibaroketi.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/3003042666.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/waduvelemaluje.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/35630136844.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/3448233392.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/gofaz.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109032357152865.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16130e5569b062---76516968202.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/30412361284.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/negeminekazive.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/rabogozo.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/lekidopixenikuv.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/3406798635.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/balaxosiluzen.pdfIn PDF document text
    • http://techbis.pl/files/file/40359623446.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/ladaronagona.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/42014029047.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=my+hero+academia+two+heroes+dubPDF 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_off0000e817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE817 19964 bytes
SHA-256: 627ce72990ac7cf72bae0428378fd4bce14a79f108fa77eb4e7018b1ab2f3709
font_01_sfnt_off00011ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA4 10920 bytes
SHA-256: 5f0fd64fb64c58244ebea95fb912e3174db170f8a2acae4f0a0c5f9527a82c9d
font_02_sfnt_off0001360d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1360D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1