Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3ea5eccc06c52cd…

MALICIOUS

PDF

68.5 KB Created: 2021-09-28 17:27:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fce3c97f1d680c645faa6fcc7e3863d9 SHA-1: 6e5b28000e1deff13fd66b1ecfefc7b10ee60938 SHA-256: f3ea5eccc06c52cd5fe112d81a0b3bec78eb46a2bce0debfc6343b32415554ea
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content indicate an attempt to exploit vulnerabilities or trick the user into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://tnhmc.com/userfiles/file/xareboxikuxixevod.pdf In PDF document text
    • https://edusfera.pl/upload/file/nuvumodadujikasix.pdfIn PDF document text
    • https://fond.ru/userfiles/file/gabivozujofetevazub.pdfIn PDF document text
    • https://oasis-travel.ro/files/20564398417.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/91222012632.pdfIn PDF document text
    • http://halongwave.com/userfiles/file/52366971385.pdfIn PDF document text
    • http://runhouchem.com/upload/files/90821027243.pdfIn PDF document text
    • http://tecksco.com/upload/files/xuxeni.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/zagubogawiwedanivapegix.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/dusuruv.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/zojujowunudafijawadukege.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/kewufanonevekoxebojobu.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/sasuxefunatakufajasemub.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3fe4c0cb6---78733875949.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/26483363663.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/godesakof.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/semonokuruliwasur.pdfIn PDF document text
    • https://jamurgoreng.net/contents/files/wixoxarovub.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/zusabujijuwunojenevo.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/28209716817.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021092714560168.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/moxafonemeraxi.pdfIn PDF document text
    • http://kleinschadenexpert.de/userfiles/file/lageti.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/nuvodozovijazo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=sd+card+suddenly+stopped+working+on+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_off0000ae8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE8F 11156 bytes
SHA-256: e62a4c9d283f307f78b22f5b7c19ee28b9bfed57dbbc0413b973980c0265ece8
font_01_sfnt_off0000c8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A3 14396 bytes
SHA-256: 4efd328ac0d35220e1110f60e2ff87ade54cbb65d06dc21b2d3c0aed1f28fa0a
font_02_sfnt_off0000ec6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1