Malicious PDF — malware analysis report

Static analysis result for SHA-256 12f5844926fff87a…

MALICIOUS

PDF

82.1 KB Created: 2021-09-18 17:10:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0463c0f1a8bb7d9d1eb78aed9cd35f7d SHA-1: d201290e09d9e05a0141c162223db1cadae9eec5 SHA-256: 12f5844926fff87a259a1f9ec0eadfcb56db5433c880f77ce113d06aafaa8104
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable domains and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware. The presence of embedded JavaScript suggests an attempt to execute code or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • 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://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/161336d0e47b84---24611233345.pdf In PDF document text
    • http://korytnica.net/data/files/33678148347.pdfIn PDF document text
    • https://www.educationsexuelle-ecole.ch/ck/ckfinder/userfiles/files/wisuzalolurufuxokavejufol.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/wafipifowurodegomexege.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/202197848285204.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/jeros.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/lutaxenaduworilewe.pdfIn PDF document text
    • https://felicityokolo.com/file/52140951500.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/jakel.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210911155000.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/jedikipifukezejolemututo.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/67676296088.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/27799523794.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/83554485459.pdfIn PDF document text
    • http://vektor28.ru/userfiles/file/zeloguvobutonevabavog.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/kofabowimasemelelorupo.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/61239700000.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/30379896165.pdfIn PDF document text
    • http://sun-tes.ru/files/file/sugufugosatojajikat.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/68012647771.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/82920564750.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/xanawirazufikitovez.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/23871206967.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/gotivap.pdfIn PDF document text
    • http://dailygameresult.com/editor/UserFiles2/files/tunej.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/73466919526.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=download+flash+game+for+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_off0000cfb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CB 23372 bytes
SHA-256: e2845eaa996e1f2eddbacca914fb8861114faa0312b1abba6e3cdfc9ffdacfd6
font_02_sfnt_off00012212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12212 10788 bytes
SHA-256: 74b6657fa3eaa0c3d5692725a50e0811895c10ce694fd6bdc4eedc79a72e44f3