Malicious PDF — malware analysis report

Static analysis result for SHA-256 abc953809017eb5e…

MALICIOUS

PDF

82.3 KB Created: 2021-10-12 08:18:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 9ade2bd34484b2c964b9caeb85d2a0bc SHA-1: 7b79bb53f96498476d3d028ecbc1ac151db993ea SHA-256: abc953809017eb5ef075d1fea9d7a4922280be829b2c4a5f53e5e7ffe58b7af5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojanized PDF. It contains numerous external URLs, many of which are part of a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely to lure users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • 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://cructi.ru/uplcv?utm_term=god+is+my+salvation PDF link annotation
    • http://stalmont.eu/userfiles/file/58768444394.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/161620d6a54daf---vujujarudinepilut.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/ximapivadav.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/dojetinegade.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/jofopufe.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/19923474668.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/14712028138.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/18589876523.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/18515823200.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/74416645732.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///nidamibanenaw.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/11105681721.pdfIn PDF document text
    • https://semut73.com/contents/files/11695178721.pdfIn PDF document text
    • http://www.angels-rest.es/ckfinder/userfiles/files/19510137566.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/65841924025.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/57ke07c0dle42t54a7vn46gva2/rasusubagu.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/mitefexozetotaxiku.pdfIn PDF document text
    • https://baptistfriends.org/media/vifagexijemeximarovetad.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/wabefutibigi.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/63113156920.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_off0000d8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DD 20272 bytes
SHA-256: 5825d11a2a2e81f033d336cda5f52ce9bce9f29240c651cadc8ccbd07bdcec2e
font_01_sfnt_off00010cfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12511 10396 bytes
SHA-256: fecee52a329b6addf60944dced92085b1a2db2be88ac4b6eeaf3bf2202894f0e

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