Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea0d79d6f0ad371e…

MALICIOUS

PDF

82.7 KB Created: 2021-09-22 11:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: de3f7ffae823d630b39019a6e2e77968 SHA-1: 3bbe08dbbc4cb7eb70aa482e99b814147c25873d SHA-256: ea0d79d6f0ad371e1c4a228529c2bd3c9880d5368c9bc7450be5c6ffeacbd751
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by multiple heuristics, including ML classification and ClamAV, as malicious. It contains numerous embedded URLs, many of which point to disposable domains, suggesting a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates this pattern, aiming to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614385e121798.pdf In PDF document text
    • https://dragonexpressml.com/userfiles/files/minibat.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/lemivisiv.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/bepatodefofifitevo.pdfIn PDF document text
    • https://drlalashow.com/php/billboard/uploads/file/47763494276.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/nopoletumafovominad.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-9-22/20210922004437801164.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/wuwuvadulurumotumed.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/35676713375.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/58720248468.pdfIn PDF document text
    • http://millecolori.it/images/file/pawakipanurutirebizow.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145597e68cef---14029081206.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/28191257327.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/xixavemoxuwixar.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/10225955526.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/95869925811.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/41512435563.pdfIn PDF document text
    • http://jcpingie.be/public/files/gelaxuvunajurarapapotex.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/nusovajofuxuxutig.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/99214489187.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/40345124049.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bopepu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=personal+finance+apps+for+androidPDF link annotation
    • 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_off0000e038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE038 17260 bytes
SHA-256: 3e98913fb76e9813cd2eb438e1f0c83ee8281ec36b82a87c44be6570fa478b61
font_01_sfnt_off00010cd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD8 10516 bytes
SHA-256: 88a6c65e6319933a7f4fb397151c51ec96b615b28bad67181a849b0e920d2225
font_02_sfnt_off000124dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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