Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8c5b7ae47468b95…

MALICIOUS

PDF

80.5 KB Created: 2021-09-14 07:30:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9f4ce8b93a54581231a2847845b752b6 SHA-1: 578c80d0b9b6de1eadd40d71954ff2dda2daebb3 SHA-256: f8c5b7ae47468b95f408eaa1829856e420da1e4906b4ed79eff1bf453f3ed450
126 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, suggesting a phishing or malware distribution attempt. The file's metadata indicates it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, which could be leveraged to disguise malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://h-st.nl/bestanden/files/37249965201.pdf In PDF document text
    • http://location-appartement-venise.com/italie_documents/files/detix.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/numiwod.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/votanexem.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/99404540589.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/24831558491.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/87335826628.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/96258365690.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/98609540238.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/72605002287.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/zigedunexepuxemusaso.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/vemijafivagapimatagi.pdfIn PDF document text
    • http://saktigroup.in/uploads/zavovap.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/tuvol.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/sebevizugava.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/nizototaxuvenofotufofile.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b15ccb8b5---fepubumiwede.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/kewefexozigemezugusobe.pdfIn PDF document text
    • https://ip-pharma.net/data/files/3473722939.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/51734841770.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/boboferukafusu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=best+weather+widget+appPDF link annotation
    • https://b2cdemo.tickets.com/content/files/vitenogosexilemonop.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_off0000d4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D7 18672 bytes
SHA-256: bea05ea829888a16f50e8f41ca9c6bd8ea8dd6d777603bf02b11f03ebf4a04c2
font_01_sfnt_off000104e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF7 10540 bytes
SHA-256: 23e4ac977056bcfd8089a72a31b3fc34fcff3ee5cfd06df6febb3ea02cf4ef47

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