Malicious PDF — malware analysis report

Static analysis result for SHA-256 794bad4ac0286912…

MALICIOUS

PDF

82.4 KB Created: 2021-09-15 17:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4ce7ab6b388850342352e09787fd4087 SHA-1: 6b249a1459ae09f28363adf023a3df09c24d8e60 SHA-256: 794bad4ac028691259974754d4d9f3767f36cf8cb0a43f98e431d2bad9606736
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://queure.ru/uplcv?utm_term=nfc+tap+to+pay PDF link annotation
    • http://kelkenaghshband.com/app/webroot/img/files/tunirumap.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/babijez.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/bateg.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/42873469369.pdfIn PDF document text
    • https://stvorki.ru/files/file/ximorimebovegozekiz.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/wepezole.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/tawetenofefuf.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/99657118233.pdfIn PDF document text
    • http://93564497.com/userfiles/73300120340.pdfIn PDF document text
    • http://jonme.net/ckupload/files/19700414079.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/velururezufowufem.pdfIn PDF document text
    • https://moolans.com/uploads/files/fagivumagugajimenaw.pdfIn PDF document text
    • http://starma.pl/files/file/polidim.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/bazanib.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/gujevugufemizu.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138c3768dbab---92013412129.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d860aa8683---tuzegazakevu.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/wezina.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/5670407795.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021091220305591.pdfIn PDF document text
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/77955446191.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/woxujotomilefozisefilis.pdfIn PDF document text
    • https://ip-pharma.net/data/files/19647663677.pdfIn PDF document text
    • http://kk-gorenjska.si/uporabnik/file/setekaleduvuza.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_off0000e025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE025 9924 bytes
SHA-256: f91e8932b93fc15750d99df44e2775d1b7c145eaec8f024a06316a0605452f69
font_01_sfnt_off0000f63e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63E 17744 bytes
SHA-256: 744ad62aa640768eca57b8916563422830d6561da17434cab995f6e6097290b1
font_02_sfnt_off00012429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12429 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1