Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ca388ecde2a32e4…

MALICIOUS

PDF

87.2 KB Created: 2021-09-14 00:23:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 43b5a3b9d9e43dfbe885316b376a0e89 SHA-1: 29537da0a668c117b2d36efd366e6a9246cd0394 SHA-256: 0ca388ecde2a32e4164db3194222e342acc8ca3c97b95666b18d2c9237ee86ff
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 phishing or trojan threat. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://crysiq.ru/uplcv?utm_term=google+android+systemui PDF link annotation
    • http://sporteambiente.it/ckfinder/userfiles/files/33804875039.pdfIn PDF document text
    • http://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/74536519552.pdfIn PDF document text
    • http://theonejsc.com/userfiles/file/vajebufuki.pdfIn PDF document text
    • http://gemcom.org/userfiles/file/bajukesujezevu.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/sirukigowokexibaja.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/wutupo.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/66477175868.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/93364665326.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/fewixi.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/xeludikop.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/jepipeve.pdfIn PDF document text
    • http://mariancozma.com/_user/file/95482043604.pdfIn PDF document text
    • http://video-cycling.de/files/file/75452432861.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/bovet.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f22785c7c2---manojofefosidufoduwu.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/bowonokezururejapuwazok.pdfIn PDF document text
    • http://www.polni.si/Images/files/mowubalijoxilijajivob.pdfIn PDF document text
    • http://vhktn.at/images/content/files/nivuseredixet.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/35832793838.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/jivokabo.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/13360337658.pdfIn PDF document text
    • http://synphabase.ch/upload/file/gevumakapujonuzajimo.pdfIn PDF document text
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/jakagivufogusugobupinaziw.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/gagagiwigo.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/16747636998.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcdb811992---pujoj.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_off0000ec7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7C 10844 bytes
SHA-256: 639b7ba8f182b3d46af6297149f43851bee0bd33a38ff7b5ff2a589482be1e34
font_01_sfnt_off00010563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10563 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D75 19192 bytes
SHA-256: 3505f11c4b31f3d2858d1d29b0fe30061e7619107fabe80da1e468b82b137f4d