Malicious PDF — malware analysis report

Static analysis result for SHA-256 502695435d402dd0…

MALICIOUS

PDF

77.8 KB Created: 2021-09-18 18:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 51310a9e0c4a79bf806ba8f8026e8161 SHA-1: 3d1c61b9d491c485a7fb9a84dd68161e3bce63f9 SHA-256: 502695435d402dd0b99ebf9256a038c971c3a9b940d5ffc291c57394c04cf707
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and numerous external URLs suggest a phishing or link-farming operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://medvor.ru/uplcv?utm_term=streaming+justice+league+zack+snyder PDF link annotation
    • https://szabobuszberles.hu/files/files/lepelowutebabeluro.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/74051322966.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/99889011260.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/kewose.pdfIn PDF document text
    • http://carbontuning.ru/file/fakixow.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/vitanujokaxul.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090615072484772.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/tagopofok.pdfIn PDF document text
    • http://datacomsystems.cz/userfiles/file/fujudule.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/8731420760.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/ridozupufamorira.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/6120284748.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/20847664731.pdfIn PDF document text
    • https://fptica.ru/images/file/55840683909.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/wajefovalarofor.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/52008169693.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/gebugalodepiwa.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6471af0ee---29659246629.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/xinipefazogosusoparix.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/zorotipajixe.pdfIn PDF document text
    • https://adikketiga.com/contents/files/guzipepunituxukulixoxo.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/kavotegijagafipopo.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/29980789871.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/kufekazavenipuvuzadademez.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/runizexagopufin.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_off0000c98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19C 17484 bytes
SHA-256: 19c101140d788b4b6f306f08e3a8fb6f9e924b436239bd60acce183a5a1d019d
font_02_sfnt_off00010f3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3D 11164 bytes
SHA-256: 5727ca7ec4e60801e313a37e247e6b407e9210420da2a0dfdbebbea3c250f060