Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c53d7b70801ffae…

MALICIOUS

PDF

76.3 KB Created: 2021-10-06 14:14:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 7869c4d3954c6d02339e6e8a112abf69 SHA-1: 6ea58dd5635a14126267c3ec704cf5eee3facffd SHA-256: 4c53d7b70801ffae213fff6c18333a97d8b5b92cf6f49fb995b4734b935eb65c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains or link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://catamma.ru/uplcv?utm_term=potential+due+to+continuous+charge+distribution PDF link annotation
    • http://deauville.ru/files/file/69382075632.pdfIn PDF document text
    • http://www.puhito.hu/uploads/43006399854.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/bifozimawagajopifaro.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/14573978434.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/53849796274.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/95527601183.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/senitosejisepajikojorul.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/86672836657.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/bojuwimosenanedanilakakol.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613690171e954---joxajugogirigurumumumuf.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/16559772237.pdfIn PDF document text
    • http://japan-railpass.info/images/blog/file/56617020629.pdfIn PDF document text
    • https://tigapilar.com/upload/files/fatosofe.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/63486747277.pdfIn PDF document text
    • http://webbyshoe.com/fckeditor/userfiles/file/wimisomogilezux.pdfIn PDF document text
    • http://offokin.ru/sites/default/files/file/14991227289.pdfIn PDF document text
    • http://phukiendoxe.com/media/ftp/file/tobemaxatu.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/44956922094.pdfIn PDF document text
    • http://ducnhua.com/upload/files/zosajufemi.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/280740251.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/88062614226.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/83805193338.pdfIn PDF document text
    • https://wasael.com/userfiles/file/diwamowofujorixazegaloji.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/83762931850.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/facfbe50b4c9aaf05cd012d2ab9038d6/86047117079.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/javoturidumejokebugajup.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_off0000c2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC0 18152 bytes
SHA-256: 9b0f98b7a22442c900ca0755d64deb9c169711d103421c0cf0b1628dac6922b4
font_02_sfnt_off00010a45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A45 10892 bytes
SHA-256: 140d0b7a133a11cf52c4940ca8185dc5557d395590da05a730fcca103198a174