Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3ea0c70166a97c1…

MALICIOUS

PDF

81.5 KB Created: 2021-10-05 09:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ac197c189dca4dc037c715e8f6a5e2a0 SHA-1: ef89de670f0842165e2d7e76a5ddee41e040f09c SHA-256: f3ea0c70166a97c141029f25dee47a8d7c87f19e602b0f655e03d2ee642f3e8d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm structure. The PDF contains numerous external URIs, suggesting an attempt to redirect users to potentially malicious websites for phishing or further malware delivery. The embedded JavaScript stream further supports malicious intent, likely for exploitation or obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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
  • 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 https://huntic.ru/uplcv?utm_term=ticket+of+leave+convicts PDF link annotation
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58704213420.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613305ec39975---lubegide.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/20210691005.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/6902508305.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/timinomom.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/87178381453.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/64921710764.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/15008536013.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/20264627014.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/zowagefiwiwiluporir.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e221626c9a---91678040362.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/jigebepibevebojapedo.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-10-4/20211004033509709953.pdfIn PDF document text
    • http://packturf.fr/files/rabalolikanu.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/93750074636.pdfIn PDF document text
    • http://www.keizerco.nl/userFiles/file/lanizuvigafojemodubi.pdfIn PDF document text
    • http://dentistturkey.com/image/files/tijesezagejol.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202110051313285435.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/39868436073.pdfIn PDF document text
    • https://panoramabyty.cz/content/levagoguxifi.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/33221685160.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/33178541441.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/gutofodukelix.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/jotinotipetak.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/61195522548.pdfIn PDF document text
    • 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_off0000dd5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5F 10348 bytes
SHA-256: 499646dd5acd02b0df3980937ebae815b061ca03adf37005e9107195a23977b6
font_01_sfnt_off0000f4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D03 16592 bytes
SHA-256: 1e67423d57b5d05cb2838bdcca7411053037bce527b2af379407bab15404e422