Malicious PDF — malware analysis report

Static analysis result for SHA-256 357eb7345c9ab73e…

MALICIOUS

PDF

88.0 KB Created: 2021-09-18 14:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bd70c3cc1dc4c962be3f30965d385549 SHA-1: 9e0b9a1357ef6c2e61139dfa34a5907ea76363af SHA-256: 357eb7345c9ab73e26e8df79cea53899ad9c47b2b7562a6214e23e09153d9b9e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded links pointing to various domains, many of which are likely part of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan delivery mechanism. The presence of external URIs and the link farm heuristic suggest the primary goal is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.
  • 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://medvor.ru/uplcv?utm_term=phone+to+tv+apk PDF link annotation
    • http://sangsangins.com/upload/upload/file/44839905190.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/78326689562.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/2a976280058177b334688a835e2807a0/75228403175.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/saxinuzuluruvepomidilex.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/21961725064.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/65079600403.pdfIn PDF document text
    • https://timminsrenovations.ca/file/tgUIyq9AK0iHUZKi.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/18640264805.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/zovofomoterulamepe.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/27908230924.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/wusezepezaled.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/45598065612.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/luzamudinixezok.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/nigexusidugetitizus.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/68153843813.pdfIn PDF document text
    • http://rafaelokazakov.com/file/92707158903.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1630558181_adfd47d574.pdfIn PDF document text
    • https://electroagro.es/pub/files/liselivunapurimoj.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/85746478785.pdfIn PDF document text
    • https://somogyplusz.hu/files/67216116943.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/29369027394.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/beridilogi.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/g21hsbv2lronolh8bqv379j58s/wiribapotedinul.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/59500315286.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_off0000f4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B0 10104 bytes
SHA-256: 1d6878e05813058b9664fb5043628655d13f4f8b2e6cd2d518465d5060c7d303
font_01_sfnt_off00010b2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2E 18204 bytes
SHA-256: 83a046803487f0d9adacbda6c2d29770a19087f97d7c90efcc097974a113eb1e
font_02_sfnt_off00013a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1