Malicious PDF — malware analysis report

Static analysis result for SHA-256 76bfb703954de6d5…

MALICIOUS

PDF

68.2 KB Created: 2021-09-11 06:15:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3cf62cc234b14f1d84bf20f6032d9c76 SHA-1: 9292884f13f15c261f3b6d76fd71718fc71b3969 SHA-256: 76bfb703954de6d5d38d7e0ea7debf2cd4c1760737f6d627ec28f715ce4a7c3d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. The primary purpose appears to be directing users to a network of sites hosting more PDF files, likely for SEO poisoning or to serve as a distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://sbairs.com/datas/files/gudamudetoxikovuferigoti.pdf In PDF document text
    • https://implant-drill.com/userfiles/file/25388887763.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/89015500324.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613be01327cdd---wolowogaluvarevezaxe.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/xoneminukesafizalugujeni.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/wuwerulipelil.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/60008922893.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/dakaludumibegaf.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/lenaji.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/sarokawirikulezixew.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/bojujada.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/77827885514.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/ba4c2345f350081cfab29dfa345fe1e4/pekopuwedafogoxewuguj.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/mudunolojukoduwidozasem.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/10746514683.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/44711228997.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210902_9E254AEB22EB091A.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/jubirut.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/91022172598.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/papiwamaveru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=boruto+episode+157+watch+onlinePDF 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_off0000ab2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB2A 11084 bytes
SHA-256: 1a43eb97a7669f58f3f66a31d96c8fdfd0d327a181da02b14c15712f864f34c0
font_01_sfnt_off0000c527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC527 15148 bytes
SHA-256: 366a4a0b6ddd6a2cd180b817a9b75d14922214ad2c6a7e71b42beccd745e9154
font_02_sfnt_off0000ebbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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