Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a18469e9ba82d71…

MALICIOUS

PDF

80.1 KB Created: 2021-09-16 21:29:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e5fade7da25e7d747558eabc78b67cd2 SHA-1: e72f01dfda1b181cc987257d6d35ec1666d53748 SHA-256: 8a18469e9ba82d719e16a31e1c74081713eab6d4310994a7cc7e8e4795a1f2c0
134 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, containing numerous external URIs, suggesting a phishing or malware distribution lure. The presence of a visual download button further supports this, aiming to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nomylo.ru/uplcv?utm_term=telugu+dubbed+movies+download+website+list PDF link annotation
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/06020307dc97f5e84231e70657120c52/tepodiwiwugirejilito.pdfIn PDF document text
    • http://kleiberit.ru/files/file/48290579011.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/33652858889.pdfIn PDF document text
    • http://orem.mn/uploads/files/vadowuzejalejagefudetum.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/pufemegajegironawesotezi.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/85193192701.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/98668093297.pdfIn PDF document text
    • http://tiquital.com/documentos/file/63869578874.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/22690475372.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613858e3b9a58---59578026757.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/lerikuwoxemi.pdfIn PDF document text
    • http://nasledie-sluck.by/var/upload/file/rixalaxagojosidixobotoj.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/suduzi.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/sesotinirajesu.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/kusezogogob.pdfIn PDF document text
    • https://buyafranchise.org/files/files/11164338770.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/kifodefiteniwegimesadasev.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/19450788809.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/vunogejipizojazuwotalela.pdfIn PDF document text
    • http://climtech.com/files/files/26799174748.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/44159316433.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/47336302540.pdfIn PDF document text
    • http://monikaknoblochova.com/userfiles/file/32910758597.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_off0000d4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F3 17120 bytes
SHA-256: 375c3e08a2864f867985e8cdca13b3888b16714ae7200b7ed10f97cae5e417e1
font_01_sfnt_off00010135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10135 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001194c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194C 10848 bytes
SHA-256: 88ee57ba4affb967d30a3c303c382f4e10cf3f4aa8a40ebed49b7a09bd6785b8