Malicious PDF — malware analysis report

Static analysis result for SHA-256 da66316e20aafc1c…

MALICIOUS

PDF

69.2 KB Created: 2021-10-06 01:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 4a3af4d73fe2ab66892fb3f63bf994f6 SHA-1: 427fdadd0e6c80377b230002d621315b18fb5d6d SHA-256: da66316e20aafc1cbb44ce1905c27e7925981b9bf1cfa255cdb060d34193f4b1
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to other PDF files, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and the link farm structure are indicative of a campaign to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9130

Heuristics 4

  • 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
  • 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://sakem.org/userfiles/files/57570021039.pdf In PDF document text
    • http://diamant-x.sk/UserFiles/file/tojazakozojibenulibebu.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/pepolirepiperajulojuvuju.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/kijetexuje.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20211004_CAE29F12BF2ECEA3.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/12940126417.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/18666485955.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/wejasavifebopuvunatuzap.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/zifuvejadabiwu.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/latiritexapilovivutawe.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/88401349970.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210911152710.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/fiwavovefexusa.pdfIn PDF document text
    • http://bipaf.org/2009_home/upload/editor/file/9584952058.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/bexewas.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/vusidumejogor.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ece480ee12---robuwelawuvefagamoto.pdfIn PDF document text
    • https://pyccenter.com/images/Upload/file/46311825685.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/topaxiwesesusuzebik.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/48496627561.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/72539083073.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/13685196922.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/0fe6cfaa37c1c9eded7843897ced954e/14943347163.pdfIn PDF document text
    • http://jlicentral.com/images/authors/file/4191488896.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=kbc+daily+quiz+todayPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D8 18688 bytes
SHA-256: cc3895a0be0787e2b985d0b28b1250fe9cefa0dd09c4363287b1263735521bb4

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