Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a8a084febbb266e…

MALICIOUS

PDF

83.3 KB Created: 2021-09-17 05:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ab91055fc81d351cbe6e3f5ef2f1971e SHA-1: 1675023cefff97c2caa1803bf4d232d498fb5654 SHA-256: 7a8a084febbb266e8d6f24be05f4f1983d1e2c48725f7efc17dbd4d3a6dfc893
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware download sites. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://sunrise-photon.com/upfiles/editor/files/84162805266.pdf In PDF document text
    • https://hoongnau.com/upload/files/65111903568.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210908_181FBB6525767F0E.pdfIn PDF document text
    • http://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/komipatek.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/38034363093.pdfIn PDF document text
    • http://pk-rowery.pl/user_pict/file/774546875.pdfIn PDF document text
    • http://sireny.net/share/files/20392438576.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/vukofegitibanu.pdfIn PDF document text
    • http://stattus.com/assets/file/35711723936.pdfIn PDF document text
    • https://osakadentalcare.com/contents/files/56808211645.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/27674961141.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/vamiwepoxedipanuxexutim.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/81146639203.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/babimefatezetexeravulirat.pdfIn PDF document text
    • http://yuhongzg.com/d/files/58313808340.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ead53d0b0a---bixofedobajupa.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/momigapibuzawa.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/vedukenivavigili.pdfIn PDF document text
    • https://mahae.hu/files/files/kuravaresukirufos.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/38301962780.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/12584003927.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/6691698195.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/xedegidipafijogaroda.pdfIn PDF document text
    • http://ctm.it/userfiles/file/xudemuxus.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/seludivupovubefew.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e488681b9---98934010498.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=square+apk+downloadPDF 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_off0000df55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF55 10524 bytes
SHA-256: cc0da6a1cd200a60d81a5e2d2d7994affabe25f0785dcf0462a5762315cea6b2
font_01_sfnt_off0000f73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4D 18500 bytes
SHA-256: 949bfdb2ee6e3a7e46fd04d4f4c70e97dc5b4a737ff17e33bf2c07976c47e592