Malicious PDF — malware analysis report

Static analysis result for SHA-256 520b31357799f4b6…

MALICIOUS

PDF

70.1 KB Created: 2021-10-01 15:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 94180d03839f2dde4bdf2b6d577987ae SHA-1: b51131a6a9a56aa277c514cd251a0beddc91b428 SHA-256: 520b31357799f4b6684208ad1d44648aa7f4206a1e0fcc8ca7e6fb3c5cdb23ed
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically identified as part of a link farm designed to redirect users, suggesting a phishing or malware distribution lure. The PDF structure and embedded URLs align with common techniques for delivering malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://archism.ru/uplcv?utm_term=prometheus+bound+aeschylus+pdf PDF link annotation
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/82028074956.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/bamibugunimolazov.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/gumurutatajizekodizudeza.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/nizelowutijemunap.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/rukuzamuxat.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210907_012343.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/tejuz.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/vitupukegufa.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/fazolavebasa.pdfIn PDF document text
    • http://divyabodhanam.org/userfiles/file/60411265693.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/98050091350.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/614cc17622654.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/2057094286.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/75581164394.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/bobalovedulav.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/4eaef84ca91cfe5183c2526b4f68802e/90198612193.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/rojugu.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/40704616607.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16139db08bb881---4266273058.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/13319242795.pdfIn PDF document text
    • http://goldmustang.ru/files/files/88037404585.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_off0000ae12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC624 17084 bytes
SHA-256: af7557858ee8ecc9ededdcd997d42cd456cbc2bf1208ed9108c7416e8b4a867d
font_02_sfnt_off0000f19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19C 11148 bytes
SHA-256: f9259b23b15aae270bba49de7fff5cbeb9639bd1e015d1f43d178887c85a6ab1

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