Malicious PDF — malware analysis report

Static analysis result for SHA-256 195b3df66f747e00…

MALICIOUS

PDF

78.6 KB Created: 2021-09-16 12:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 117fca609cb333b9f113a482292b0f0d SHA-1: 87dd23c5dcbf8854a9ceaa7eae1529583c45e977 SHA-256: 195b3df66f747e00431bc519bc950e1aff3de6edfcdf20a9ac1d3fbdb4d38f72
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous embedded URLs pointing to various domains, suggesting an attempt to redirect users to potentially malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a structure designed for link proliferation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://ambulatorioveterinariocamali.com/userfiles/files/98911865795.pdf In PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/mezipisejezonowoku.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16133268c0ad42---bevinexujemavewuletoru.pdfIn PDF document text
    • http://scsytech.com/upload/files/tajop.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/busikepogizavaxupetizesi.pdfIn PDF document text
    • https://krainaogrodow.eu/zdjecia/fck/file/tomowumesenozetesujed.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415e8e3c8b9---79452366182.pdfIn PDF document text
    • https://computerzone.pk/file/84130063929.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/dofuduvefewavofovujijubo.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/vifuzat.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/kodomozu.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/52979973962.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/87663852347.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/99505788227.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/69583222227.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/putarabapamudonuka.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/66320333256.pdfIn PDF document text
    • http://autavrabek.cz/obrazky/file/63163299235.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81739598865.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210902_D1CA5F81D64103C9.pdfIn PDF document text
    • http://groupelamiri.com/uploads/FCK_files/file/poziz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=gps+ndrive+para+androidPDF 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_off0000ce3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3D 18352 bytes
SHA-256: 0ac269b96499e252c9cbbfde35e4927a71043e091350dd36ba4570a98cbc0610
font_01_sfnt_off0000fdac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAC 10344 bytes
SHA-256: 69c0f574c485625d31d218d9746f58f21d9a4315608b7adab0a1b1e300c87d77
font_02_sfnt_off00011527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11527 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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