Malicious PDF — malware analysis report

Static analysis result for SHA-256 f97e9febde20b428…

MALICIOUS

PDF

69.5 KB Created: 2021-09-29 02:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ac94c2eee4efded9e1a126c61fe55b26 SHA-1: e25a63e9648b70cf824de4b63590559a0fd29844 SHA-256: f97e9febde20b428e07228023e0153d7c5f6ec050d5c67a2f8bc56074916d6f3
126 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, many pointing to potentially disposable domains, suggests a link farm or phishing lure. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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.
  • 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://www.habitat-morvan.fr/ckfinder/userfiles/files/nopewevazekuluzi.pdf In PDF document text
    • http://chothuexehochiminh.com/userfiles/file/lifaki.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/31507920858.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/nowuwabepinidowoxiveleron.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/tabusazaxegolimita.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/jinowi.pdfIn PDF document text
    • http://ofcourselc.com/admin/uploadsfile/xeterufazijiwaz.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/sasibofuzetudinodoreboje.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/46456952011.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4ce382638---bewuni.pdfIn PDF document text
    • http://storemisr.com/uploads/files/21593136797.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/13751862338.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/wimexopefelolulijoxar.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/1f4d6bc902e4bb5001218a3b6c4206a6/lonowe.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/pelexajazuwakuririvef.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/dudutobowajitozudoz.pdfIn PDF document text
    • http://kngsm.in/userfiles/file/17982644218.pdfIn PDF document text
    • https://conrays.ru/f/data/1953409073.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/tigowexewibakaxovozig.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/faziroremerereg.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/24346097571.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109240559008424.pdfIn PDF document text
    • https://designclarf.it/file/94843685493.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=websites+like+fmoviesPDF 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_off0000b271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB271 10300 bytes
SHA-256: d6b3b0c7ab093f304f8f8854e23fc8c715603d56ddb2e161a1c2bdead3bba9f9
font_01_sfnt_off0000c9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B4 15416 bytes
SHA-256: 4294df22c9768f0138f0bea5d836ed26dc90f41e4734e1605906f0fdee9ebf7b
font_02_sfnt_off0000f0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1