Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc40b86b1e687034…

MALICIOUS

PDF

71.4 KB Created: 2021-09-25 02:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b08faa6009f6e0909a9f28978df3581f SHA-1: a7b7e8214fe7cefca52e9cdfef03832ecd5330f0 SHA-256: fc40b86b1e6870349c53dec7b3409e7aa40878e92f03989fe6a191af8e2481d0
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with many pointing to suspicious domains and one identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The PDF structure and embedded links suggest it's used as a lure to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://raffaelecavazzoni.com/userfiles/files/71815596506.pdf In PDF document text
    • http://dakdekkersindex.nl/images/uploads/6324184080.pdfIn PDF document text
    • http://spakimthi.com/upload/files/21388287412.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/76709276830.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/e1835919a3f4f3eb484031d4c8dd8309/rifilifikelulefodaka.pdfIn PDF document text
    • https://oferta.lt/i/File/88910681837.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/wuvemewotejugo.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/jopezenewo.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/badokavununugepubu.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/49339737930.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/mifor.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/72789870407.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/zexinafu.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210906_AE884584A35F59C0.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/sonegemudenojaduginot.pdfIn PDF document text
    • http://worshipedia.net/sites/default/files/file/78344914624.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/lubikamuwokedimiri.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/wutiwusemavojaxun.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/46693550202.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/66465191525.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/37250217132.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/guzafuzupuvuxewo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=zarchiver+apk+download+for+android+technical+slatePDF link annotation
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/59485848772.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_off0000af92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF92 10924 bytes
SHA-256: e88b7e2b896c995a03822a437f38c94b830d5114cde5746e9466ef067c40a048
font_01_sfnt_off0000c8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE101 17448 bytes
SHA-256: d7c720597aea6e74d7c6602a5119f8ea05470ea6cb1c6ac7aa3a9e8d14a67279

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