Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad1732e19b30a42e…

MALICIOUS

PDF

85.5 KB Created: 2021-09-13 12:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0e49ceec739d458becd799bfa7cac108 SHA-1: 01a61948f4e16f6de01564d369f4f0e00b163637 SHA-256: ad1732e19b30a42eca0f15fb98a14fe1b15e32b32afebf91fe1c66a80e9e5301
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF containing embedded JavaScript and numerous external URIs, flagged by ML classifiers and ClamAV as malicious. The heuristics indicate it functions as a link farm, directing users to various disposable domains, likely for phishing or to download further malicious content. The presence of embedded JavaScript suggests an attempt to exploit vulnerabilities or execute malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://laborke.ru/uplcv?utm_term=best+free+widgets+for+android+2019 PDF link annotation
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/66306803778.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/runikilokemobijok.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/rizagexubeladizag.pdfIn PDF document text
    • https://onlinendttraining.net/files/jumivuromelufub.pdfIn PDF document text
    • https://kawanmto.net/contents/files/99068857455.pdfIn PDF document text
    • https://adurucui.com/ckfinder/files/dazikovazedalabojused.pdfIn PDF document text
    • http://newshop.jp/archive/file/wetipipan.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/gemenubimukifuxotivo.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/27499256457.pdfIn PDF document text
    • http://yilip.net/userData/board/file/79535498336.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/19411918946.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/82852054786.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/21289422446.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/53975293450.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/84064945707.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/161344bbea6cf1---tanutalikonezawasesuloke.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/zovenamibidomerijigiw.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/62090044896.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/83409305342.pdfIn PDF document text
    • http://contactfm.be/userfiles/files/bedimireb.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/lozepeluxu.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109101624147091.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/7935597784.pdfIn PDF document text
    • http://piannocreativo.com/js/new/fckeditor/userfiles/file/36691251122.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_off0000e7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AC 11084 bytes
SHA-256: 05fcedb0fe40320bf3e9aa78e1afdec8b257aa9d89b430a230817e3e8ca33acb
font_01_sfnt_off000101a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A1 18028 bytes
SHA-256: 1325b3671794fd9a6f5f1f933f0c05bb951a8c825139d23a8582b3022cf922c7
font_02_sfnt_off0001300e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1300E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1