Malicious PDF — malware analysis report

Static analysis result for SHA-256 3db4c109c41ce3b2…

MALICIOUS

PDF

69.9 KB Created: 2021-10-03 09:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e2c637aeffabb1b5e36f2724581ce848 SHA-1: f3165bedc7198f951731df872696fa7833730c8a SHA-256: 3db4c109c41ce3b22231515da8d766455e3f6d1dc82089abb03556ea4acf2818
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 links to various domains, many of which are likely part of a link farm designed to obscure the ultimate destination or distribute further malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting a tactic to evade detection by using many distinct, low-reputation hosts. While no scripts were explicitly extracted, the PDF structure itself is being leveraged to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6493

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
  • 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 http://szpk.hu/_user/file/21705696960.pdf In PDF document text
    • http://ketphatthinh.vn/upload/files/2767308899.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/ca319d55b23fbd919df92907e2c61534/matudujejaseloxa.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/78727638556.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mesefusenisifi.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/50283857935.pdfIn PDF document text
    • http://edukoc.net/userData/ebizro_board/file/89622461111.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/32531189467.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/lovarozi.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/85886402512.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef4aaad3e3---26369157416.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/lukapujitomojawin.pdfIn PDF document text
    • http://serenetour.com/image/upload/File/xulinogixamime.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/sojutusisu.pdfIn PDF document text
    • http://biosite.ru/images/news/file/gapavegaxupipaxemopa.pdfIn PDF document text
    • https://buzyhub.com/files/sologineko.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/fodasalaz.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/mapevoruwani.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/kifivuvexemevo.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/cef43b33e31158a2068eaec839ab04c6/15124658298.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/magejuvumokobajirevi.pdfIn PDF document text
    • https://luminex.pl/upload/file/89230486219.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/bixutevemimabinixilaxutom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=equation+for+surface+area+of+a+rectanglePDF 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_off0000b32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB32E 10740 bytes
SHA-256: 5b0ff521cb762562ddd9acbd12dfd50328e097fbc10da2dd11f8a1460911e4c2
font_01_sfnt_off0000cbad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAD 18272 bytes
SHA-256: 36ed7be7de2280cd47a465fc6e14a855858b3809a64fb97924a3cce9779b29cb
font_02_sfnt_off0000fb18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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