Malicious PDF — malware analysis report

Static analysis result for SHA-256 79c7463c1725eef9…

MALICIOUS

PDF

72.0 KB Created: 2021-09-26 12:12:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 17f2448cf7240faacd68c9a915c9d9d0 SHA-1: dd6971a18c5603b616c9d001289c01563a9b20a0 SHA-256: 79c7463c1725eef9a3437895f5afec29d8e8649975798ae71f4d6557a9ea85f6
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links pointing to disposable domains, indicative of a link farm designed to host malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded URLs and the ClamAV detection further support this assessment.

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://queure.ru/uplcv?utm_term=property+brothers+home+design+game+cheats PDF link annotation
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/90153470485.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/bitowimemavewifubizu.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/85819132672.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/66768909721.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/80314753704.pdfIn PDF document text
    • https://begili.com/uploads/image/files/lulufad.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/bopunev.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/36997284346.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/32961f66b66760352b4de43aa0931527/9925736001.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/11797235232.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/86392440183.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/91311043898.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/dalat.pdfIn PDF document text
    • https://seger.cz/userfiles/file/73041704566.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/41656812066.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65154925959.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/30698113229.pdfIn PDF document text
    • http://radiopoint.cz/userfiles/file/tubemiwimuxi.pdfIn PDF document text
    • https://www.geya99.com/ckfinder/userfiles/files/97136058466.pdfIn PDF document text
    • https://siltri.com/fck_upload/file/dagosenofozu.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/wepukuditaturimumij.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/39786832676.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16147779de1f34---12922456370.pdfIn PDF document text
    • 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_off0000b47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB47A 17132 bytes
SHA-256: cc95b4f06cddecc9f87bb984f4da30bca36dc633296d1ecea7865a54acbf4d3f
font_01_sfnt_off0000e06b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06B 11168 bytes
SHA-256: abaf3b7e474e93d0521face783dcf59314662ccf7a9d08cfdd376708f0b25343
font_02_sfnt_off0000f9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1