Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c51e8aafa7becbe…

MALICIOUS

PDF

83.5 KB Created: 2021-09-12 03:06:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 34d6b6b15e8f8de8c17ceea3f58bb7e9 SHA-1: 292373f1885906ac628b0e13ed923d74ac204be3 SHA-256: 0c51e8aafa7becbe97ab43e77e95a183351ec8c5d027d89f68c71c2d15927512
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are embedded within the PDF structure, suggesting it functions as a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to the file's use of disposable hosting for multiple links, reinforcing its role in directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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.
  • 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://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://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_off0000e386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE386 10624 bytes
SHA-256: 959385a6ae1063a31cba43c5b49c35891ae21e75e6953d8067107b04903be7bb
font_01_sfnt_off0000fbf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF8 17400 bytes
SHA-256: d61f8e84838c5012a2cda830281d3eeccb64a565dd2540ff50a5147a0e06aa68
font_02_sfnt_off00012939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12939 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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