Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c33442c4777d7fe…

MALICIOUS

PDF

72.1 KB Created: 2021-09-23 00:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c9d74135a466b7431785b108a44f64a8 SHA-1: 10e0c8af3b61760ce615e7c926a4f406411bc67a SHA-256: 4c33442c4777d7fe8d1711bae51ec7579997b94ff6eba99dae5104962bc154cf
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. ClamAV and ML classifiers also flagged it as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure suggest it's intended to redirect users to potentially malicious sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6664

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 https://oniceh.ru/uplcv?utm_term=the+killing+joke+comic+read+online PDF link annotation
    • http://resheto.ru/users_images/fck/file/40475101280.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/rupixekesew.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/54935018341.pdfIn PDF document text
    • http://videocycling.info/files/file/51920950099.pdfIn PDF document text
    • https://eurotig.ro/file/jivubodebovem.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/jebupelaxurufilapada.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/jubokoxunogugumaj.pdfIn PDF document text
    • http://lemma-studio.pl/userfiles/file/82538644534.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c66ac563c3---zizefeju.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/sululinibolu.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/wufokobomibimofabak.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/42806161442.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/jagofineropoborapudagudom.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/vuzurepikutiwoxepofab.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/11763920389.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/guxupedipevajaz.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/joxezopalovuwimizejulem.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/34149910702.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/wikizepawojejeramoluwekis.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/wotiraxuxijifujid.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/99503617152.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/48ab093fb6ee8df78b9c1093cc269a66/45103527604.pdfIn PDF document text
    • https://bczenekar.hu/files/file/vokeserijozilag.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/vebebejobamatuj.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF8 18168 bytes
SHA-256: bf9abcecd04caf4bb124bda8172fb23f2791e95552acf096cf7b82e3715df4c3
font_01_sfnt_off00010bee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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