Malicious PDF — malware analysis report

Static analysis result for SHA-256 d95069c2faa25523…

MALICIOUS

PDF

66.8 KB Created: 2021-09-30 14:02:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 31be7ced82e1e79d351bf83d17cadc0e SHA-1: 13566ca66fd086be0da8b3fd8c9bd458cec282a7 SHA-256: d95069c2faa2552303e106faca3d8eba39740c1bbc907c0d09a7c13de59752f0
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to suspicious domains or are structured in a way that suggests a link farm. The ClamAV detection and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a phishing or malware distribution attempt. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristics suggest the document is designed to redirect users to malicious content, likely for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3938

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://anitacalderon.com/ckfinder/userfiles/files/vomilebitono.pdf In PDF document text
    • http://ladna.pl/user_images/file/gerujopunep.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/gogelubefigerusesizene.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/18563866726.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/17547503298.pdfIn PDF document text
    • https://e-motorcycle.tw/upload/emotorcycle/files/20343904821.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • http://sweepinstyle.com/userfiles/file/68008925873.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/lanawodidasefelunalopato.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/gobevidarozozuzalonakex.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/13317069209.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/bawijiji.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/73518787835.pdfIn PDF document text
    • http://nagyberki.hu/sites/default/files/fck_uploads/file/xidejabu.pdfIn PDF document text
    • https://nusantarabet4d2.com/contents/files/bitufavitikekiveloxiloka.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/57948659871.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/rupelejodeserapi.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/jijebunani.pdfIn PDF document text
    • http://zamgph.com/uploads/file/240617222880.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1613bda711fe07---9188665084.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/40133519808.pdfIn PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/93883089424.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/sirokufasosuxijaku.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/pr7dt0u32so312a6hovt3h7ia4/48649630297.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/gunizevubolapiragezofa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=barron%27s+sat+chemistry+pdf+free+downloadPDF link annotation
    • 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_off0000b077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB077 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC88E 11172 bytes
SHA-256: 15b663681c3c6e42def1f501a9cd714b1e13b6f310ea8f0dd10da4b29b3970de
font_02_sfnt_off0000e29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29E 15616 bytes
SHA-256: c67c4747b503a82eaaddd016edb30f4da850a0a3496018340f3c9fdf4de5ef06

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