Malicious PDF — malware analysis report

Static analysis result for SHA-256 99e5e75893a1961d…

MALICIOUS

PDF

88.6 KB Created: 2021-09-18 14:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: efa5c550bbba3cb78b71b7477c05b170 SHA-1: 27e4a904ac0e07cc29ab0e8d97ce80de52e716dc SHA-256: 99e5e75893a1961d38ce9f14a20368f5667e7fc04935ee65f9210bfd148f2cb7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to download further payloads. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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
  • 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://fapannimario.it/userfiles/files/36420725279.pdf In PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/30464177660.pdfIn PDF document text
    • http://chiron-ventures.com/chiron/home/img/upload/files/210906023147578839o6a75.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/nititi.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16145b82e4194a---47707520232.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/ngcvh2d6ir7cuf9p2jckpkl89o/70650436504.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/pamatawadujirasabobepiguk.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/ruxabogumifik.pdfIn PDF document text
    • http://patroha.hu/file/46675283133.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/40904053463.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/bebokaridew.pdfIn PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/vikoxuvevas.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/wetopapavikevawotalat.pdfIn PDF document text
    • https://gencatakan.com/upload/file/mokeratopuvol.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/rokuvav.pdfIn PDF document text
    • http://lumieye.com/userData/ebizro_board/file/sedixipagaw.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/86972797347.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/38577147218.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/80687348468.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210910102811.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/xuzisalolexunijawulupumiw.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/veduv.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/4359424657.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/nifuxima.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/10270518053.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/voxod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=watch+latest+tamil+movies+for+freePDF 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_off0000f782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF782 17520 bytes
SHA-256: cef60bc0c8d37f406913667d9292b9312e8e9b1ad07ad8a057ef2f79cd9d0075
font_01_sfnt_off00012482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12482 10556 bytes
SHA-256: 909040c4d45e307a7e438a2760ae9ec40101a972c49095bdf063452e6875cb32
font_02_sfnt_off00013ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1