Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b9d116e47fc430f…

MALICIOUS

PDF

81.0 KB Created: 2021-09-21 04:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3cc78680ba2402bd251dc09a6dcd1743 SHA-1: dbae5366722d8701422f01455d135359334c9b59 SHA-256: 5b9d116e47fc430f665f6ecd14b6afc42f0ddf1ecac52a1989cfc895362a6bf8
142 Risk Score

Malware Insights

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

The sample is a PDF file containing embedded JavaScript and numerous external links, flagged by ClamAV as Pdf.Phishing.Trojan. The ML classifier also strongly indicated maliciousness. The presence of embedded JavaScript and a high volume of links suggests an attempt to exploit vulnerabilities or deliver a secondary payload, likely for phishing or malware distribution.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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+root+m2006c3mg PDF link annotation
    • https://quanghuydulich.vn/img_duhoc/files/88888909797.pdfIn PDF document text
    • http://eksternest.be/images/file/ratebeboxabixaxidogijis.pdfIn PDF document text
    • http://hanarotalk.com/userfiles/file///89174403075.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/neponabuzig.pdfIn PDF document text
    • http://home-hj.com/up_photo/file/migig.pdfIn PDF document text
    • https://kokomanis.com/contents/files/zogod.pdfIn PDF document text
    • https://onecre.com/images/content/files/ropuwegozebazivekazawuril.pdfIn PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/tusil.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/faxiragevaxonajajana.pdfIn PDF document text
    • https://moulindelarroque.com/userfiles/file/luvukekarirodefujaf.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/xabaruwujilokem.pdfIn PDF document text
    • http://metallpress.ru/files/pawijijikilojulodufuf.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/tuxadupopopepufukujidin.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/53667134452.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/juvaruwedegera.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/94429089144.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/39140537443.pdfIn PDF document text
    • https://mavibusiness.it/file/rimekopetujerazarak.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/pisevazituraza.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/getevirobololunozase.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/55248274829.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/puzefimevo.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/26139976778.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/94385177646.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_off0000d8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BD 10528 bytes
SHA-256: d79817f2c823f024433b1ab61afbc2d423ee2aea38fdddb845befef5a3e51194
font_02_sfnt_off000108d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D6 17636 bytes
SHA-256: fdb9b01014d7f1da320b00448ddf95905100c9a5082545ff450f9c9683493827