Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1a46b92a6ef8bbf…

MALICIOUS

PDF

70.3 KB Created: 2021-10-18 11:31:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 46f024b8f855d48375a04898ed63cd64 SHA-1: 54d90c8c02ccbf0ecfac6f072212feb29b14081a SHA-256: d1a46b92a6ef8bbf92f41cd35837dc8f260db0c3f1884e1c18794840695991de
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to potentially disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, suggesting the document is designed to redirect users to malicious sites. The embedded JavaScript likely facilitates the redirection or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5735

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.
  • 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
  • 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://vet-arrighicolangelicristilli.eu/userfiles/files/zegepusopusika.pdf In PDF document text
    • http://tsnpharma.com/upload/files/pixot.pdfIn PDF document text
    • http://cecev.com/stockages/files/sobufadurimumejivunuliro.pdfIn PDF document text
    • http://gymostrov.eu/gymostrov/userfiles/file/kogerurop.pdfIn PDF document text
    • http://natpuedu.in/userfiles/file/loromokof.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/japufezopijo.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/67446301353.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/mojuminimekubo.pdfIn PDF document text
    • https://clubharison.com/userfiles/file/14698525523.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/92234049024.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/25570725986.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/254965640.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/koduvojezediwuvij.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/38381168442.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/79484f7e443873cd58caddf73e76f745/pewuze.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/75351489845.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/25478069111.pdfIn PDF document text
    • https://umartravel.com/files/kumebofulifapode.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/7682376665.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/27786238285.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/41975163706.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/vunawenamuva.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/lesijivi.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/93122452734.pdfIn PDF document text
    • http://mapect.com/upload/fckeditor/file/kekotovekadilisawunajem.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/jederujeku.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/60108428715.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/KGDyd8lM0uI/uplcv?utm_term=swelling+in+throat+and+neckPDF link annotation
    • https://b2cdemo.tickets.com/content/files/kepapalubozekavujog.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_off0000d83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83A 16156 bytes
SHA-256: 6a50c2f1b8da6a1de077056979db9ce1f4180773877d5912827e2257d72a46e4
font_01_sfnt_off000101f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F6 10732 bytes
SHA-256: e0e236884a2d54633abf937f0479c46480cc9c5a1bb56902a3563f5fad21aaff

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