Malicious PDF — malware analysis report

Static analysis result for SHA-256 16238b526b32a8e1…

MALICIOUS

PDF

76.6 KB Created: 2021-09-20 00:13:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e20cfd4ee2b86800874e6e6614be3693 SHA-1: 9a13cfd0b4f21a3af1294ccf7fbee1a6d57e0e76 SHA-256: 16238b526b32a8e16c48d4570ba55a18d2ecbfeb9a5e3f0a1d5b966ca5b9684f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting an attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 5

  • 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.
  • 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://coretry.ru/uplcv?utm_term=videoshow+apk+pro PDF link annotation
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/rimifikekagefu.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69068906099.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/21555637194.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/61470116a599b.pdfIn PDF document text
    • https://strefaokazji.pl/uploaded/file/vujoxafumizofowazavidem.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/gekixu.pdfIn PDF document text
    • http://squash-fitness.cz/userfiles/file/gewovesi.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/1q4h5gfg6eichno80vag65nkb0/20777728217.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/37560503304.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/robizasunigudel.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/836883225.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/38594261453.pdfIn PDF document text
    • http://sinsg.com/files/fckeditor/file/sopiduxaf.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/biramurek.pdfIn PDF document text
    • https://onecre.com/images/content/files/88027467148.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/8497382809.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/86391408158.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210909114456.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/63798192260.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/29427815547.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/31252143509.pdfIn PDF document text
    • https://guijek.com/userfiles/file/55929919910.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/88931954449.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/80553776785.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/82572506393.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/54574832381.pdfIn PDF document text
    • 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_off0000c813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC813 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02A 10388 bytes
SHA-256: 2dfbddee2eccbdf12a2f230ac48210c8aca455da5e50b84b67eb62f074417143
font_02_sfnt_off0000f7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DD 17400 bytes
SHA-256: 7d07bc940a511f1c569407d0e1ccb34af246dfd3ae1a1871742557def7c0620a

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