Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b1d2af1e46ece14…

MALICIOUS

PDF

83.0 KB Created: 2021-09-15 22:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ee2b7833694f0bea1acbd6dbb7f8c46e SHA-1: 536b359ef1d67a34b5d3cfd68433a3689d5c9e93 SHA-256: 1b1d2af1e46ece140e1b71a2d8deaa9e5150ab810d274cb007a3016948060f45
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to disposable domains, indicating a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cathyourhair.nl/js/ckfinder/userfiles/files/baburok.pdf In PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/778ce125847e22399119f3632a238f00/84736059636.pdfIn PDF document text
    • http://devison-matras.ru/upload/file/74385456944.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139147247ebe---55131747127.pdfIn PDF document text
    • https://yourwebcenter.com/files/file/luture.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/5458085644.pdfIn PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/13436626915.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/pabodagebesasapi.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/gedalofobosusanivilisim.pdfIn PDF document text
    • http://irinabailey.com/upload/files/99480924467.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/bumikabopazoneguwij.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/7757197101.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/76763439499.pdfIn PDF document text
    • http://e-sportis.com/images/upload/nevafadefam.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/50912010888.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/siwonaxifesofonun.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/mubimifukofakewajutaz.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/1785809198.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/tijatuduta.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/bijaxiduposofi.pdfIn PDF document text
    • http://velocimapper.com/webfiles/file/78510266841.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/pituwuxijojivekidok.pdfIn PDF document text
    • http://haai.org/upload/file/dafizudotanadi.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/34396473231.pdfIn PDF document text
    • https://lalicorne-hotel.com/userfiles/file/24665882922.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+can+i+save+a+webpage+as+a+pdfPDF 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_off0000e24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA64 10832 bytes
SHA-256: 5ade77900cc5144ba9846b897bdb2ab66ec079d157a3a8771854ba2cb9ceb473
font_02_sfnt_off00011319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11319 16796 bytes
SHA-256: 87a9868f3ec141710ce748f16700419d2071d03798309a6cb0a6e4cacc2e43fa