Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6f87f5c42c02e52…

MALICIOUS

PDF

68.9 KB Created: 2021-09-27 11:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c2f379cd62bf19177cbc786c7a811d02 SHA-1: 218883e147117e736c8e5db93d27fa5fd3d0537d SHA-256: b6f87f5c42c02e5284ef96e4f667a86cf5be4b86a32126f7450736ed9a8b5715
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to redirect users to potentially harmful websites. The presence of embedded JavaScript points towards an attempt to execute malicious code or further exploit the user's browser.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://archism.ru/uplcv?utm_term=rap+recording+studio+apk PDF link annotation
    • https://alshaabcoop.com/userfiles/file/genidipov.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/bafuxokovalokar.pdfIn PDF document text
    • http://ktai.lmg.jp/upload/file/12909316045.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/wutabakorafevasojojojid.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/69808781408.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/dowowurot.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/13127630082.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/solijazogozomifegavowot.pdfIn PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/vudojololikuzopug.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210908032427_5v8iiy.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/85704362340.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/7496299144.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/fakejitewafivizosidof.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/64327632020.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/zapubo.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/94476933982.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/budovugaripajejokoxudivin.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/99629709061.pdfIn PDF document text
    • http://www.terresdescaraibes.fr/file/92468836405.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/ig0c1u1tkflu639m71nd2fgn6s/45957097344.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/rutitisudimavabi.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/dimagosojuv.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/wenipoboretik.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/41944480269.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_off0000af35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC74C 10880 bytes
SHA-256: 75fc885080a918b6d48252e4a3cf35c851fc6c5e1302a5e2c0da6226a88c364b
font_02_sfnt_off0000e067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE067 15024 bytes
SHA-256: 779423f643c72542297872af8436db5d095af3de659f65f2be26880dfa76cb94