Malicious PDF — malware analysis report

Static analysis result for SHA-256 9970aada9cc18fff…

MALICIOUS

PDF

73.5 KB Created: 2021-09-10 08:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ea26f4feb95a6ec10473023776449494 SHA-1: f77e432d813470c6036fa656e04cc5fe9992f2f0 SHA-256: 9970aada9cc18fffcdde2172af0be5179e2517e49754d8e3a302ebecde7ea203
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates this is a link farm designed to host many small PDFs, suggesting a phishing or malware distribution campaign. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pistant.ru/uplcv?utm_term=price+of+persia+game+download PDF link annotation
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/49412635208.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/73774384411.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/newapaxej.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/38771677418.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/xawisulajuvumok.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16135866a1ed4e---51449921365.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/62156137855.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/27091038022.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/9130780611.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/4832347988.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/26818053132.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/66616483910.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/14b182162ff5806cc18519029c543dea/50271619892.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/vatijutemefetirav.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/nizobefefoxovibuge.pdfIn PDF document text
    • https://zzhqhi.com/d/files/sivejotutadutogirowuxavaf.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/mokavawefonusog.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/tegerawetibik.pdfIn PDF document text
    • https://bdprescription.com/ci/userfiles/files/30687377225.pdfIn PDF document text
    • http://sxsasa.org/images_fck/file/1630822774.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/72892502846.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/jutaf.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/gedelerokakudopufer.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/8178867880.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_off0000bcf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCF1 10952 bytes
SHA-256: ec553a1758fad092fb66a16fc6a47dcdd95fba232a93e8795813907dfc397f5b
font_01_sfnt_off0000d625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD625 16456 bytes
SHA-256: 41aa5f1225b11906f54a8ce3b396288c27ec70fa5b5632e66f4b2dde64721768
font_02_sfnt_off0001009a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1