Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f216efc4ee53837…

MALICIOUS

PDF

74.5 KB Created: 2021-09-16 20:36:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c94044e24cdb4914a8a7e5a867030c21 SHA-1: 40992d0d27b498bf14e4c96b5c7f4c308bdddac3 SHA-256: 2f216efc4ee5383778aad4afb726201b51250fc36c4fc8a2e053837aaed37fb4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains, indicating a link farm or phishing infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://sevenseahotel.com/uploads/images/files/14365874979.pdf In PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/bupasosakebuzotiwuzefeji.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/94839389866.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/mulixipe.pdfIn PDF document text
    • http://redskap.ru/userfiles/file/23531688164.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210904_DC442BE7464DD5EB.pdfIn PDF document text
    • http://sin-hua.org/userfiles/29241819457.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/fasusexemidarepij.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/50601972391.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/wenisajobu.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/80655135542.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309554b2c6f---88296357972.pdfIn PDF document text
    • https://olterus.info/contents/files/47886945350.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/jezevusaxarekigerinulam.pdfIn PDF document text
    • http://drironcat.com/images/file/zagubapitinelapigatonimi.pdfIn PDF document text
    • https://granitnet.hu/editor_up/63900600440.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348ece7e4d5---91419756721.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/nizibeligimixewu.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/sigisolizezepajuler.pdfIn PDF document text
    • http://handgun.ee/media/file/walep.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/lojerovefuzutubolab.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/babelixeborazama.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/kufuvozi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=certificate+of+completion+ojt+letterPDF 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_off0000bf83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF83 17240 bytes
SHA-256: b40ca9ad5b4717c5ad0b5066866336e597cb0c29516f63f35d7ea8601ded190b
font_01_sfnt_off0000ebce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCE 10636 bytes
SHA-256: 63bc394e1799c5ddd1187823fe718fbf7972d662c1867ed7d0fc78f6c9e02126
font_02_sfnt_off0001041c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1