Malicious PDF — malware analysis report

Static analysis result for SHA-256 633e40b8b469fbee…

MALICIOUS

PDF

77.8 KB Created: 2021-09-19 03:18:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d0e930ea967bf1db69bbf90f5e7cf0d6 SHA-1: f1d7fb39564aa44f1d2cd3e849473d1fbc7438e5 SHA-256: 633e40b8b469fbee33bfe097dd460c6f17280a21c17cf7a5d683a75b085c49db
154 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, including one pointing to a raw IP address, indicating an attempt to redirect the user to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to host a collection of links on disposable domains, likely to distribute further malware. The ML classifier and ClamAV detection confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://crewmak.ru/uplcv?utm_term=demon+slayer+mugen+train+full+movie+online+watch PDF link annotation
    • http://fitnessklub-impuls.pl/uploads/assets/file/pixiponokowufililigo.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/rusegufetokiro.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/87771967616.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///4981256848.pdfIn PDF document text
    • http://giteduguedesboires.fr/userfiles/file/jujinovomas.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/mojutixexetezobu.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb0f8ec6aa---rurupelesixatadim.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/43106085325.pdfIn PDF document text
    • https://music-group-store.com/upload/files/89205719276.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/xinawadezix.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1631577924JKbp.pdfIn PDF document text
    • http://ccadl.com/files/20210919044438.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/51267142856.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/27241019981.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/50812878427.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16137ec64eaf4d---65323653233.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/54878845677.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/xitefupewi.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/mutefuvezemun.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///46134903360.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/18204178443.pdfPDF link annotation
    • https://jmclimatizacionhvac.cl/images/subidas/file/nukoxenuleravo.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/bitanu.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/97706686095.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_off0000c9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B4 17724 bytes
SHA-256: bf8658ffc6e9cdca8338e7f45fd69b9e4821c65d8c1cdbe64755f2f03d796a0a
font_01_sfnt_off0000f779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF779 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F90 11148 bytes
SHA-256: 59b4b0373c9cb1a5a548411b3c30d5c38a12ccebbacad73d62a49a351cfe9d38