Malicious PDF — malware analysis report

Static analysis result for SHA-256 079315aa27ceef7e…

MALICIOUS

PDF

81.0 KB Created: 2021-09-19 18:18:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 382927ead311a0e2510b9a65dad15fac SHA-1: 7fc17aa571f4ab72613b7a6029df8eb905400ad1 SHA-256: 079315aa27ceef7e681ff1d84db8eab17c9ac1556ff465439b6e243b56c5d5a7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host numerous links, likely to phishing or malware sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • 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://tenfci.org/userfiles/file/84273238104.pdf In PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/1958346712613cdfcc57732.pdfIn PDF document text
    • http://hainfelderteich.at/30713167825.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/55073930500.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9195d9fe4---mupikonuzevujolupuja.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/55297436097.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/wexavotewinoso.pdfIn PDF document text
    • http://reylab.com/userfiles/file/23737415334.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/kuwumejexojowulosuta.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/52639945691.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/120806215229.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/41021886699.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/75330272031.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/41698206122.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/82388371213.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/26703244420.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/66412060376.pdfIn PDF document text
    • http://thepducphat.com/upload/files/5280561494.pdfIn PDF document text
    • http://vietcem.vn/public/default/ckeditor/files/90419633654.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/87229735268.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/80002096713.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/43753882013.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/14438915187.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/64408307784.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/wasejomajudowuluxebox.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/22763974239.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=what+are+developer+optionsPDF 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_off0000dc1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF430 16396 bytes
SHA-256: f581273592379388b5e5019027af15638a344a2958d99be0e1cf7f9f1273560d
font_02_sfnt_off00011ec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC5 10548 bytes
SHA-256: 9a139ed2a1d5d0b26260fb416c495697b0c3ea9ea2a13cce660d2ec581751e91