Malicious PDF — malware analysis report

Static analysis result for SHA-256 707573b95591cd13…

MALICIOUS

PDF

89.7 KB Created: 2021-09-17 21:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d4be2da6b3cfa78c98c1c275f02277e8 SHA-1: e198f6f8ad5f1c266b789d0228eff0dfa6d41b03 SHA-256: 707573b95591cd13651278cb0cca434a02f766383e7d9db5369353c979f077e1
166 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'SE_BROWSER_INSTALL_LURE' strongly suggests a social-engineering attack aimed at tricking the user into installing malicious software by posing as a necessary browser update or extension. The presence of numerous external URLs, many with 'utm_term' parameters, further supports a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • 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://synerhu.ru/uplcv?utm_term=dgamer+hack+mod+apk PDF link annotation
    • https://aathichudi.org/userfiles/file/56930850096.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/41110490015.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/verezoxapapaxojudopotoke.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/57699922782.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/89833407759.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/20226071657.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/dukomapi.pdfIn PDF document text
    • https://robertbah.si/files/file/91219012212.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/6593062503.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/xizujezaxemenog.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/kofofibuvafobisuzogizad.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/24124510176.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16144cbb557ae4---31470644961.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/50191900899.pdfIn PDF document text
    • http://contactfm.be/userfiles/files/fuwotoxesudir.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/31754537072.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/marokeporibeluminetupo.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/gaxafekopinuromaxigepav.pdfIn PDF document text
    • http://lecieldesandes.fr/ckfinder/userfiles/files/24778975922.pdfIn PDF document text
    • https://e-midas.ro/files/file/boputuxijubojezotose.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/49809997219.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///pekobota.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/maxidamifonolalazuguzubox.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/22325428212.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/39150163004.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/sivitelirafumi.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/gafezunikufiwajol.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_off0000f92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92D 10548 bytes
SHA-256: c50f597b243a9d7ff9e9fb181de6a960e2c09e55fe717444e5938000f24af119
font_01_sfnt_off000110ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12911 18404 bytes
SHA-256: 62860b8a1f078dbd149ab2fe0dbd74972d0729c994e23f3e3a69223e357baa56