Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f3f2cba0813991…

MALICIOUS

PDF

85.1 KB Created: 2021-09-19 01:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5342b3fb3d7335b650b2f7d8c3f71084 SHA-1: 66ffda339e292265f6e1368c615433e1fe31f074 SHA-256: 16f3f2cba081399155128b49f3453076fdff5d02dd840c71083665f4f59e638a
146 Risk Score

Malware Insights

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

The PDF document impersonates a cloud file-sharing service, a common lure for phishing or malware delivery. It contains numerous external URIs, including one pointing to `https://queure.ru/uplcv?utm_term=xender+app+file`, which likely serves as a redirector to a malicious payload or phishing page. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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=xender+app+file PDF link annotation
    • https://perkunasstudio.com/uploads/files/202109111201121325.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/kafarekotopa.pdfIn PDF document text
    • https://km2804.com/ckupload/files/61309509300.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/pemixulibifusotijotedomu.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/piturena.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/161354e73ec0a5---71365320076.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/raramusofifupuzi.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/47327777993.pdfIn PDF document text
    • https://texasbordervolunteers.org/userfiles/file/65810768261.pdfIn PDF document text
    • https://dacola.com/upload/files/mudifuzuzofageta.pdfIn PDF document text
    • http://findusafranchise.com/files/files/kebivekufatabifovusidadan.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/83930623084.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/xewimiguramesolagije.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145803d81a04---tesujopogagovigu.pdfIn PDF document text
    • http://annabarons.com/files/files/41942177978.pdfIn PDF document text
    • http://dr-temt.ru/images/file/898790266.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/forunekemon.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/jorodevavegijebinajafamu.pdfIn PDF document text
    • http://espokebar.com/uploads/files/95804109646.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/bakosulekisexozin.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/muxusab.pdfIn PDF document text
    • http://inoxbienhoa.com/upload/files/14089770955.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/49049361135.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/ketegovij.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_off0000ec29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC29 17148 bytes
SHA-256: fa45a8bafe4753cbd8ddb15a7d5d87e1ad83f5fce6aa22103be04e8982d0ad0c
font_01_sfnt_off00011898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11898 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130AF 10112 bytes
SHA-256: ae15bb13b20bf942189039d1790fb699071a1ef9c60a3432621be86ddd1d3bd0