Malicious PDF — malware analysis report

Static analysis result for SHA-256 248f1e5ef89ebaaf…

MALICIOUS

PDF

78.7 KB Created: 2021-09-11 07:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3fad988b452bcfdbc92240844c69a7b0 SHA-1: 371994d077702725bc892664c2b8d3a749c575f5 SHA-256: 248f1e5ef89ebaafcaade6b2c749a7ee32ca42717f3719eaa6c6d6d0b3dc760d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://synerhu.ru/uplcv?utm_term=watch+big+momma%27s+house+online+free PDF link annotation
    • https://questyme.com/userfiles/file/95280657622.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///8930821023.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/59985560874.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/jasalotazofuvabed.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/7396310421.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/bibabibobigan.pdfIn PDF document text
    • https://quangtriasianwindow.com/uploads/image/files/jebojodivamenatanategiw.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/87486438880.pdfIn PDF document text
    • http://napiarsaigh.com/images/xigitabuwebumoxajokuj.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/18972602719.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/boxedejijidolema.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/vanirubelivetaxulek.pdfIn PDF document text
    • http://klhl.com/userfiles/file/2850625370.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/85159417658.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/xewidotumajuxo.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/13129172244.pdfIn PDF document text
    • http://ilovestory.com/upload/file/situtareboditonogik.pdfIn PDF document text
    • http://koala-al.com/d/files/tovux.pdfIn PDF document text
    • https://onecre.com/images/content/files/gelidofesajorozerajigif.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/putazoketajof.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/fepezekobokevuwiriz.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613b81f76539b---rutemawisifanimegoxagef.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/fudiregijotisu.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_off0000ce56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE56 11052 bytes
SHA-256: 0ac5409e9057d0339ea48f3d4703eeb4fff06dc74206999a497e7a0bfdf821e3
font_01_sfnt_off0000e7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F3 17476 bytes
SHA-256: a04bb670f0375c01acbdc1cb5800feceb7016a138d6a45999bd54addcae7acf3
font_02_sfnt_off00011553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11553 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.