Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b994d2e43b416ee…

MALICIOUS

PDF

80.1 KB Created: 2021-09-16 11:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e443159bc1d7403258f2f769e5d6c76f SHA-1: ad80d532cdf5866de2e48ada6259a233344f4edd SHA-256: 4b994d2e43b416eeada5fdd021e3e83dcec5c7417750e95bd2f06496f94e33a1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, indicating it is designed to redirect users to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is unreadable, but the presence of embedded JS and a link farm heuristic points to a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://infrive.ru/uplcv?utm_term=commutator+split+ring PDF link annotation
    • https://nichecnk.leaddeehub.com/userfiles/files/nuremedujipizegiv.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/38767902264.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/31074145736.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/64233900042.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135335761736---68086024976.pdfIn PDF document text
    • http://garderoba.sk/images/_file/64069778935.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/d4f2f48350c87c637b9e26a43a652641/jabitimodat.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zinevojadavopifimikagi.pdfIn PDF document text
    • http://sjhtractor.com/d/files/korinolesepaliresujil.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/73995284584.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210913114820198.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/58705589563.pdfIn PDF document text
    • http://superbarter.sk/media/file/xigutitozapajem.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/vemidakoxofawoxus.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/23411962282.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/61740561431.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/6837720946.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/digosatomominorobo.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/tuweziwuwisunugumog.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/sizozewemujubozafinazaz.pdfIn PDF document text
    • https://castel.ro/userfiles/file/95321941073.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/27382912046.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/jobusasef.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/36981182817.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/gozelako.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/72397170277.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_off0000ce3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64D 20212 bytes
SHA-256: f508462f5eb17f967871c111ac811722da0b92ac599d536fbeffd439c098e9f1
font_02_sfnt_off00011ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB5 10592 bytes
SHA-256: 7631d8e3cbaa0aae315a2eb867bda19b7caefecfb84e38b8bddbfb4fe340d629