Malicious PDF — malware analysis report

Static analysis result for SHA-256 49a6ba21475b542c…

MALICIOUS

PDF

76.9 KB Created: 2021-09-17 12:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f9cf5c98536f2d7c97190bc7915fb090 SHA-1: 187b355917514b8d2fd6bf8aaedf5d9d40e2dc6b SHA-256: 49a6ba21475b542cc2c34c26c4f655dbf7f59b40c7ec35c0ca4bc2dde9e03bb1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://ossokahve.com/upload/file/11596138887.pdf In PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23884040906.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/72011761932.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/baf4e770e936cb1d46771219e93d126c/zugiriwaruzolevamawer.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/39557218663.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/vubonijivusapelojipamaxo.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/71472818754.pdfIn PDF document text
    • https://tunguoilon.tunhua.vn/ipp/images/uploads/files/felediwobedobuwadoju.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/51555406994.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/bubozobotomi.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/kikowuwitepowukosulim.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/sumajoxuvaxebibokugime.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/tovima.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/43751693188.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/tokavafovotidixefinab.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/8643758979.pdfIn PDF document text
    • http://marisqueandopremios.com/campannas/file/64144160701.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109150205086367.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/lapesuv.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/bozaxinugaposorazujugije.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/19120010179.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/fimawefa.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/28284090998.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/28131321811.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=android+hintergrund+apps+dauerhaft+schlie%C3%9FenPDF 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_off0000bd2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD2A 20552 bytes
SHA-256: c5b8033114aa589fcaba566cab4eab7a980822b4fcb28595d49bb94e42944d61
font_01_sfnt_off0000f1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C7 11188 bytes
SHA-256: 6d401ed1a9bab8c2e38915b3b82b4e0484a03d50467655c32fce3e73c6dea8aa
font_02_sfnt_off00010bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1