Malicious PDF — malware analysis report

Static analysis result for SHA-256 da4ac446675d9cc4…

MALICIOUS

PDF

72.1 KB Created: 2021-09-12 03:06:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 008b2a7156df724793e27acc437d1d86 SHA-1: c50cc049639d57f9f94126ad9f70cf8a0ce4d446 SHA-256: da4ac446675d9cc4b18116ed9943e58740a979226d2501064cf2b2cfdcc85796
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high number of embedded URLs, many of which point to disposable hosting and utilize UTM parameters, indicating a link farm or phishing lure. ClamAV detection and ML classification strongly suggest malicious intent, likely for distributing further payloads or redirecting users to malicious sites. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7666

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://philabc.ru/uplcv?utm_term=glycerol+and+fatty+acids PDF link annotation
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/60916473469.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134b0703d04a---3134566455.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/79087847962.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/335003758.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/kinat.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/61652305853.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/pubebelebunodar.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1631279229.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/54123166053.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/74749502711.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/xebasugitifupadalunag.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210902195019.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/pavuzawamevomi.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613188521c3f8---rusiwipuba.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/46663015002.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/33334249753.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/diwikewu.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202191265164268.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96065867937.pdfIn PDF document text
    • http://pvvc.cz/files/wijulomakeb.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/55833610647.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE386 10624 bytes
SHA-256: 959385a6ae1063a31cba43c5b49c35891ae21e75e6953d8067107b04903be7bb

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