Malicious PDF — malware analysis report

Static analysis result for SHA-256 14936ee91f5a9815…

MALICIOUS

PDF

83.7 KB Created: 2021-09-19 12:27:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d917e4492ff016244768599f6ae10ce8 SHA-1: f550c53ad1108f55df7ea29f9d3067d3db2d40ac SHA-256: 14936ee91f5a981511e37d4fc8dcb3454f6983a4d7f0d41cb1cf2af2990fc412
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://oniceh.ru/uplcv?utm_term=how+to+hide+status+bar+on+android PDF link annotation
    • http://infosierra.es/images/editor/24864258057.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/48731130462.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/79509636073.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/37897635339.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/xifobepejuge.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/53098054575.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/doroberewodi.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/97261199944.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sinavobawolomebe.pdfIn PDF document text
    • https://expomediainc.com/upload/file/sabekodavurimawerine.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/magepidozegixifid.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/43536216331.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/38645885460.pdfIn PDF document text
    • https://ismart99.net/upload/files/28122028243.pdfIn PDF document text
    • http://bikaji.zohukum.com/ckfinder/userfiles/files/58001986602.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/nizurivunuf.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161447cc9873e5---dusipofekajabewegesipot.pdfIn PDF document text
    • http://foodchemsino.com/d/files/68486670082.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/pulibemovulep.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/vubito.pdfIn PDF document text
    • http://svx.su/ffile/file/sefuvoxavujutuxud.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/kilibu.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/91794189419.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_off0000e012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE012 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF829 10616 bytes
SHA-256: cdef909dfc34ddc56bed8004db962fdb984e9ee042fe9faa42cfb5a7fdfb0141
font_02_sfnt_off00011065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11065 18780 bytes
SHA-256: a28e22ab2394b306479812ace383093f5548cab100cf453044ca9be90dc8c15f

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