Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e10456f2a076d3f…

MALICIOUS

PDF

77.1 KB Created: 2021-09-15 00:21:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c5886e8a4a96049b6278b2a7ec84ae00 SHA-1: 2c7fdd3d6062bb3657905eda15ca7d15aea80e21 SHA-256: 9e10456f2a076d3ff7ab2df9c58819569eb0b0ffa497818dccd76b564d5c9cf9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and the numerous unknown URLs suggest a link farm designed to obscure the ultimate destination, likely a phishing page or malware download. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://op-gold.com/ck_image/files/30146987141.pdf In PDF document text
    • https://grnca.org/img/files/files/fatopekemitowopem.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/86462461508.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/raparakem.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/selotej.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/mipimugojureminitit.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/nofamuxetu.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/jiparaluleninidutiv.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/90380952997.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16134ecb612654---82391181343.pdfIn PDF document text
    • http://simp-q.ru/userfiles/file/ledulemebubo.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/59569220673.pdfIn PDF document text
    • http://xn----7sbndn5at.xn--p1ai/uploads/files/togikamuzelak.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec7ea554d4---batexevejomo.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/5141888005.pdfIn PDF document text
    • http://orderkai.com/uploads/files/musiforawafebexame.pdfIn PDF document text
    • http://373113.linker.tw/files/zoduxalumimudome.pdfIn PDF document text
    • http://wgadget.com/file_media/file_image/file/likigili.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/kujumepolilewig.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/98105419053.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/bisogesuxupitugoronisula.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/9449198015.pdfIn PDF document text
    • https://kar360.com/resimler/files/36033567992.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=letter+to+new+home+buyer+from+sellerPDF 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_off0000c669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC669 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE80 10620 bytes
SHA-256: 20f52f7f07ca7fc4f2c829b834bdbe2ce844d0310645012d1c5dc5e7f93c8874
font_02_sfnt_off0000f6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AA 18464 bytes
SHA-256: 7eb3932f686f2fbcca8fbf6fa7cf5cc2da73a3ad7aeabe54f0dbd6f9b696bb1e

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