Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce9ef3f86f10fc10…

MALICIOUS

PDF

72.1 KB Created: 2021-09-18 19:38:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9c98138d96298c1ba85c544aaa8888af SHA-1: c0bab00b21a5e97bcffda5c3f9850e06b55d9cb9 SHA-256: ce9ef3f86f10fc10711e5a46eb57e47c0ed1b46a7754f04310c42db3cce3982b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics indicate the PDF acts as a link farm, with many embedded URLs pointing to other PDF files, some hosted on disposable domains. One URL, in particular, uses a 'utm_term' parameter suggesting a phishing or social engineering lure for VPN downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://atdawnwelift.com/userfiles/file/meselebi.pdf In PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/27413456183.pdfIn PDF document text
    • http://www.polni.si/Images/files/65713600660.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/divosipaw.pdfIn PDF document text
    • http://rc-modeller.se/images/file///99197069922.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/29352224412.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/zewipatasivojusajuzav.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/gonaruzagotodoni.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/76124174599.pdfIn PDF document text
    • https://simbhaolipower.com/images/file/linumiwowirurawomek.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/58676229219.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/28227823161.pdfIn PDF document text
    • http://regcureguide.com/files/files/81421223065.pdfIn PDF document text
    • https://ienter.bg/files/46668480392.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/4000432688.pdfIn PDF document text
    • http://viorina-deko.com/images/file/38353919047.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/34ccfd78bdd76ebcad008d2715879c9d/bobab.pdfIn PDF document text
    • http://emploi.nat.tn/ckeditor/ckfinder/userfiles/files/1061566215.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/fadojixanifilenamo.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/lenosuz.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/27644645392.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1b54c0296---74626092040.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/xomubinofopakefevezif.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/85070481138.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=xy+vpn+download+apkPDF link annotation
    • 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_off0000b3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B5 18888 bytes
SHA-256: ad2a54b4e8bd8184bd80f35f02cec5c4b9b2db8b23bb3b879d54269a1f80d6f5
font_01_sfnt_off0000e441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE441 10160 bytes
SHA-256: 0facc6bad9c13727ab2cce8e9764b0da64f2c31a55b9277d7ff6a0543ad32c00
font_02_sfnt_off0000fb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1