Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aed15cb71315fe6…

MALICIOUS

PDF

77.1 KB Created: 2021-09-11 13:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 750394d40a32e6c281f3ed7920566a6b SHA-1: 068de2bf9e56602062652e2e47ee81458a6078e0 SHA-256: 8aed15cb71315fe65a62c4b3824b7f2636f5a1bf9f45d43fd653fecad629bc8a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF's structure and embedded links indicate it is likely intended to redirect users to malicious sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 5

  • 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.
  • 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://turkihale.com/userfiles/file/ In PDF document text
    • http://parkety-patemal.sk/files/file/xemikumekezixomogomote.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/1644968966.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/41618951821.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb9b97b7fa---66074774529.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/84428195806.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/56806437831.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/patuwefowojuxafe.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210903_C9000659130E519A.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/83429784997.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210903105202_720026251.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/77275528967.pdfIn PDF document text
    • https://agrando.cz/files/file/toxetevibomujalixeje.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a90a9bc944---23299750138.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/85908396157.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/bisukat.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/japamizo.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/wofalanevaf.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/burewotidowukereko.pdfIn PDF document text
    • http://dtjxbpzx.com/filespath/files/20210911042458.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sebezopiwu.pdfIn PDF document text
    • https://aaaxxion.info/images/file/95148057866.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/17443929031.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/gajomuwumegabivowov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=pirate+mirror+proxyPDF 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_off0000cad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD5 10312 bytes
SHA-256: 60c73a096dd1235af202f8de41f880d1791d0cac8da605ebb8fd469c9fdc01be
font_01_sfnt_off0000e223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE223 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA35 17656 bytes
SHA-256: ab00d9a3588774e080f3ef12e3b554f921d8562b172e939cc8c2b239868fcb69

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