Malicious PDF — malware analysis report

Static analysis result for SHA-256 651a40b20161e918…

MALICIOUS

PDF

81.6 KB Created: 2021-09-09 19:17:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f5ff61968dfd351ba712b24a7872af35 SHA-1: 5c35b51b93c7765e6b34a277ae1d919ab5dfb039 SHA-256: 651a40b20161e918e8d9767f07df9706b0b9e8837120506010b9e61516e0fe6f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and flagged as link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://herningbadintra.dk/app/webroot/upload/files/koxejemebi.pdf In PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/fapoguxanixe.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/mosataliresamugoj.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/20958041377.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/39c6fbfefc3a824ed5fe10bb640caa16/waboredajosedinegar.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/putajubunudenasow.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/56733603091.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/13115454635.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/28481314557.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109020329487492.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/wasibuzulibezikawanolifek.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/revimorar.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/24704567213.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/57326885367.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/jaxonixurupazugidamobizo.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/85895004615.pdfIn PDF document text
    • http://amdind.com/userfiles/file/wigubivapizafuxosas.pdfIn PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/mupokizejatubazidojaji.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/89695534765.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/sogovivumo.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/539921c5b5a8e08f189f55f08de8d1d6/49920188337.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/60335623477.pdfIn PDF document text
    • http://isystem.hu/userfiles/file/mazowolexogilanoxadal.pdfIn PDF document text
    • http://hanleyresources.com/images/44265813352.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-8/20210908052704225908.pdfIn PDF document text
    • https://adci.vn/data/upload/file/8922067180.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=mr+driller+androidPDF 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_off0000da6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6B 18124 bytes
SHA-256: 0f21ffac0a4d1369a4052f45a310861c0251d32197519f557e3bcf8dd0212122
font_01_sfnt_off00010a36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001224c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224C 9968 bytes
SHA-256: e063924e81c840f70ff5ad5943e8604fb06484ab10f95fe9cc3857581d6d7861