Malicious PDF — malware analysis report

Static analysis result for SHA-256 28b7a237e77cb4f2…

MALICIOUS

PDF

79.7 KB Created: 2021-09-24 12:21:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8fc2014adb67262685a10d5a3090b649 SHA-1: f9f10dbe3983c6c44a028b79f1bde972360bea9c SHA-256: 28b7a237e77cb4f28ce49df44dc6404b8e2b085a4e05af5a034bc93111156f81
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. This suggests the primary purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://topflexsports.com/uploads/woruteribuwiwep.pdf In PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/zazaxeredaburefaraki.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/dajumevupotewavinomeguwi.pdfIn PDF document text
    • https://proia.bg/userfiles/file/72907294454.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/koziburu.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/bumefilab.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/52053940399.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/30647157804.pdfIn PDF document text
    • http://trivio.it/userfiles/files/95773095609.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/53412221769.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/67720463486.pdfIn PDF document text
    • http://hejia-ele.net/upload/komapulolupiza.pdfIn PDF document text
    • http://turnyras.lt/Files/file/sakumixidozefo.pdfIn PDF document text
    • https://moscreen.in/cmsfiles/file/16207572311.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/dotakanisab.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/jobejasatalovowekapup.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/jevarufodiloxotusezasof.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/67581554871.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/52134379877.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/wakajawa.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f254c4bba0---71505461118.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=fist+fight+full+movie+freePDF 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_off0000d6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D0 16276 bytes
SHA-256: 3e449edd12dfd688ccbf0fb0dd94effd4e6275b5135cf6b435314da6be41f77c
font_01_sfnt_off00010112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10112 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11929 10540 bytes
SHA-256: 2f91fea32b081bed0494fa4bf70ee0ec9669e062db515b2d4ad0798e61f00516

Open this report in the interactive analyzer, or submit your own file for analysis.