Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a158d0089368ba2…

MALICIOUS

PDF

74.5 KB Created: 2021-09-18 17:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bb225be6ab5b6b574a75927c1f717567 SHA-1: 47fb0fbdd5d499c31ed174b4a5f1c6bb4d1775c9 SHA-256: 5a158d0089368ba2557b57bf001f79f3ebeb5c2c8f992afbdd712348479ab04c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous external URIs suggest an attempt to lure users to potentially malicious sites. ClamAV detection and the ML classifier further confirm its malicious nature, likely as a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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.
  • 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 https://mamadona.ru/ckfinder/userfiles/files/65799124274.pdf In PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/mgio4gfri83u23hjia45l0agv1/48234048237.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/71714946126.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613058be1815b---baruluzijaramimatewoz.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/labaxeg.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/xevimavizapisazowikajin.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/vodemegegasiwofi.pdfIn PDF document text
    • https://harteron.ee/userfiles/file/wolasosexap.pdfIn PDF document text
    • http://fthyhs.com/resource/docContentImg/file/2021-09-09/064c0fd39846bd9a21075101ceec9f24.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/batebujalukavexozuge.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/pegutonevoget.pdfIn PDF document text
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/redutonajuvewanixotu.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/gibawibegojopi.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/namadedabeguk.pdfIn PDF document text
    • https://loppisidjupdalen.se/images/uploaded/file/mesejaxixonozatafab.pdfIn PDF document text
    • https://adci.vn/data/upload/file/dibikoviximalenimiku.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/12836802853.pdfIn PDF document text
    • http://gmart-express.com/demo/uploadpic/file/gorixo.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/zadof.pdfIn PDF document text
    • http://dasbluemchen.com/97902108618.pdfIn PDF document text
    • https://vzglavniki.net/data/file/87659812718.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/76417568195.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/xuxakezomagik.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/dexenajojabegenupaworon.pdfIn PDF document text
    • https://polandpools.com/contents/files/87120846835.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/diladelemonowe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=second+phone+number+apk+modPDF 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_off0000bfd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD4 17188 bytes
SHA-256: 4268c4e81e4e920547bf86af1ec759e217545d94935a2906923e2ea94b0c6e7a
font_01_sfnt_off0000eb9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9B 10784 bytes
SHA-256: 17ded411bda42328ada8cf096eb8c970818686dbaa2781375ef5c9b777755d88
font_02_sfnt_off000103f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1