Malicious PDF — malware analysis report

Static analysis result for SHA-256 8449d943f722cc45…

MALICIOUS

PDF

69.3 KB Created: 2021-10-03 10:32:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5501e5041a3da883ac131f3de87c9425 SHA-1: 1796aa35a527d934e4b94c7cc08fcadb580f7215 SHA-256: 8449d943f722cc455edbebfa3f94d978b792037a21e7cac5ee481ab9097553e6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs to execute code or redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm its malicious nature, likely serving as a lure to a malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • 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.
  • 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://peaceinsrilanka.lk/userfiles/file/60077117951.pdf In PDF document text
    • http://mmprogetti.it/userfiles/files/korupozuxupimanujugev.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/44114594244.pdfIn PDF document text
    • http://rejs2013.cycling-recycling.eu/imgturysta/files/tudemufil.pdfIn PDF document text
    • https://tipresentoio.it/images/file/26435116856.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/49114715118.pdfIn PDF document text
    • http://intersonik.eu/upload/files/51185574328.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/naxafaxagikezogifitopoza.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328264052d3---13813048062.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/rubewesuni.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/79577485380.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/20700492744.pdfIn PDF document text
    • http://premo.at/userfiles/file/93276605498.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/32549811403.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/4882031638.pdfIn PDF document text
    • http://mediacast.vn/ckeditor/upload/files/43105110556.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/87034646615.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/23045548287.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c7c2e14d5---54680772960.pdfIn PDF document text
    • http://djapm.com/userfiles/file/xupufepeluzik.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/jamanigarapoxun.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/18187074700.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/55239140005.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/pamanigiditikedun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=excess+hair+growth+pcosPDF 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_off0000b1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1AF 10676 bytes
SHA-256: 7607f063f8c3c04e407ae6865310dfca0bee277516343f53eb6ade8e91655621
font_01_sfnt_off0000ca73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE285 14832 bytes
SHA-256: c3cb0b453ad3a1b9978bba2bea6bd6699d06effb93de425f3ce4668ee5c1d549