Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe9d1aa2b0d11fd8…

MALICIOUS

PDF

79.7 KB Created: 2021-09-15 16:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2d09414cd308a30aaf0543ad5293690c SHA-1: ec25934156ca0f6992e16ef57ad8cf0db44e0679 SHA-256: fe9d1aa2b0d11fd8b0a6026dc9b73ce9daa1b74d9906befa589c69ee1148c686
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics identified it as a link farm with numerous external URIs, suggesting it's designed to redirect users to potentially harmful content. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5932

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
  • 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://wastran.ru/uplcv?utm_term=instagram+threads+apk PDF link annotation
    • https://sandp-engineering.com/ckfinder/userfiles/files/66709710743.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/vewudamaguzebevoxite.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/zajutavuzamefo.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/23853906628.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/55159213705.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/mozofaxilusulopirapefax.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/tevidubatero.pdfIn PDF document text
    • http://sergeybazarov.ru/file/retekewik.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/64817874395.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/rifowidaza.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/11973114731.pdfIn PDF document text
    • http://elitacasa.it/images/file/pibemawamojegoxutugere.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/redimogubopejabo.pdfIn PDF document text
    • http://kmjmt.com/news/upload/file/210909035622560400ebk9o8.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/lidufigakute.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/33587241390.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/gofekixodit.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/xigagamawafubumeroneb.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/61c16e56bdb526f6a830cb7af7a8dafe/95618450132.pdfIn PDF document text
    • http://orthopediedelft.eu/files/xajujom.pdfIn PDF document text
    • http://chinazzjx.com/d/files/moxagubabilotupor.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/bonexifamif.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/85833867690.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141beb1b1e44---gaponitafesofopa.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/83057046535.pdfIn 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_off0000e0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BC 10624 bytes
SHA-256: 48684638852d1086081b077110d92b60567c19ae37419bb3f41b806418e403d4
font_01_sfnt_off0000f898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF898 18024 bytes
SHA-256: 12abdcff520588fbde94fe6b942f12bc1feebfa95dd9441df5381988e6597920
font_02_sfnt_off000127b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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