Malicious PDF — malware analysis report

Static analysis result for SHA-256 60971b55803e45fd…

MALICIOUS

PDF

119.4 KB Created: 2021-09-01 06:43:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 27a083177ceea84f349fc31f8f69bda1 SHA-1: 354e5a0f0da79728a4e14b1a7f6040cca57ed19e SHA-256: 60971b55803e45fd407a65c6ce5e5ae8a6307a7367130609fae489082ff5186d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm used for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.vegagastro.pl/upload/file/zudojanipofiradib.pdf In PDF document text
    • https://blnk.eu/userfiles/files/dogomoxavasisaxewowelid.pdfIn PDF document text
    • https://tanthuantelecom.com/upload/fck/file/54219980910.pdfIn PDF document text
    • http://teechart.com/uploads/images/files/18760329738.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/buxil.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/fudevusifovaledinawedo.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/foretisefarilanojov.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/40593835261.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/54030968746.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/ziwisub.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/xapejafaz.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/27628230839.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/titezasabuxoxetezu.pdfIn PDF document text
    • https://cargotavio.ru/files/file/mopowudijipipewokiro.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/xedazewuxezuwegeraret.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/ef0cfc54de4b7791963b9d39e99cbcbf/23752071913.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89529673747.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/31003079197.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/f51c6a059a48eb896a0781818542e011/berajexovisaxefiwub.pdfIn PDF document text
    • https://vestol.bg/files/file/37574405879.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/jupetadifilavomavusa.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/fidepujupop.pdfIn PDF document text
    • http://zonwering-belgie.nl/ckfinder/userfiles/files/14835212106.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=wavelength+and+frequency+relationshipPDF 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_off0001631a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1631A 21956 bytes
SHA-256: 1ff266a89ea31d73a9a78691f6d0037e9abd76a23f68e7c02b7430226777ea31
font_01_sfnt_off00019cd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19CD5 11320 bytes
SHA-256: de15ce9b9ca6d780557484b941938981897f795c043b56c6f511ac89ee57011b
font_02_sfnt_off0001b6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B6E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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