Malicious PDF — malware analysis report

Static analysis result for SHA-256 99a1b2013bbafc5f…

MALICIOUS

PDF

105.4 KB Created: 2021-10-17 08:35:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 051fb86634697451fff08970f9b8d6d7 SHA-1: ca8ea78ecb27b2782b830a03f302ca3b2ccaf71d SHA-256: 99a1b2013bbafc5f35ad2fd829e9d20f1ffae7e6f0f7f5db3247d9cc1c47c65b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as a malicious PDF by multiple heuristics and an ML classifier. It contains numerous embedded URLs, many pointing to potentially malicious domains, and is described as a link farm. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6335

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://www.nissan-utilitaires-melun.fr/ckfinder/userfiles/files/mamebavafididapixuw.pdf In PDF document text
    • http://secretsocietygroup.com/temp/vinney/HTML/userfiles/file/vibuvominopilegobajubig.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/63721432712.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/67940891564.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/99281583022.pdfIn PDF document text
    • http://vedepcuaem.com/luutru/files/16111202524.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/wixesivu.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/safesanaguripuroxawizulem.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/zonuzarowikexudinebomel.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/fobenixose.pdfIn PDF document text
    • https://greenways.at/userfiles/file/66320920544.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/13713594338.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202110102042472006.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140cdf7014fe---85809134474.pdfIn PDF document text
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/noximinulovakilenudo.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/dipemo.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/40686422377.pdfIn PDF document text
    • http://gucaoyun.com/uploads/file/111049365322.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/dovutijuzobasana.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/28051385339.pdfIn PDF document text
    • http://it-hair.com/userfiles/11911181949.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/35191332660.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/riminaruvesopi.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/D9plVHj2VOU/uplcv?utm_term=explain+the+importance+of+understanding+customers+and+the+marketplace+and+identify+the+five+core+marketplace+conceptsPDF 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_off0001432a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1432A 18444 bytes
SHA-256: a1add223f48724e89c69c127ea0484dc508ed37e57b2fe042bb830df16840f9c
font_01_sfnt_off00017358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17358 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B6F 11524 bytes
SHA-256: 967ad5d2bf90fbb8872a4b1f1d47219b974f846dae7d031e253c5a1d78132fe0

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