Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd2617911c649176…

MALICIOUS

PDF

68.8 KB Created: 2021-09-24 22:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 1fee4e0844cf0b28047ba87587312ee7 SHA-1: 50862c8013bae6b7272a79e5c75c5f5fd58d4f13 SHA-256: cd2617911c6491762cf5046aa2edbce7f76534aec98a8fc56f2ce1e89e0d5694
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as an image-only document designed as a lure, typical of phishing attacks. It includes numerous URLs, many pointing to disposable domains, suggesting a link farm or redirection scheme to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/xinonudujog.pdf In PDF document text
    • http://konemara.hu/userfiles/file/67013482668.pdfIn PDF document text
    • http://it-hair.com/userfiles/94696821041.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/9a0e090fb22f4f40b2c11308ec6c7b0c/dotozetixulivadiw.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/susezenawuwokevenap.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091219564954.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/43140792646.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/takezafasesun.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/nakobuv.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/87246907804.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/29994026390.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/kabevirunajawurowakab.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/57063802160.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/fipidowixanelifejegabebus.pdfIn PDF document text
    • https://sinarwaja.com/account/files/53690446838.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/62249076716.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/nafejizaje.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/kaxele.pdfIn PDF document text
    • http://sasalidayanisma.org/uploads/file/436040624.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/674522924.pdfIn PDF document text
    • http://dentherapia.hu/files/file/legagowuduzatusemezavudod.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/8cdb76f5428c7e370d16d6205e5d68d7/52423200095.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/vabonikisesawapuwasoxedak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=difference+between+mvc+mvp+and+mvvm+androidPDF 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_off0000b08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB08D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A4 10860 bytes
SHA-256: c551e568bb5a7e5cb21c3757c042044d7dc9d868c01eecbd91987dc6b9d01c1e
font_02_sfnt_off0000e191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE191 14312 bytes
SHA-256: 4c0aa7898d7cf19d714a8dff8252e388fecf5e90bd27f7e5d5eb5f7ad420dc07