Malicious PDF — malware analysis report

Static analysis result for SHA-256 8342a90498fddefc…

MALICIOUS

PDF

79.9 KB Created: 2021-09-10 11:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c9247a30e565e098ca42bdedd04be462 SHA-1: 3b055fb0c568169f900d0ffe9386a31e31dd8121 SHA-256: 8342a90498fddefc903f665a8820a2c021ab4f87598d56a6a849e4c0812195f8
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, suggesting a phishing or SEO manipulation scheme. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of exploitation or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://qunjl.com/userfiles/files/71451363805.pdf In PDF document text
    • http://montaze.org/democms/userfiles/file/selovefiwuxaxurudojofito.pdfIn PDF document text
    • https://interconformity.ro/images/file/41462621305.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/15109428143.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/51014966316.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/38704580493.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/pipuxunedodexixol.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16131769d1af9c---zumip.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/61373fcf418ed.pdfIn PDF document text
    • http://sudeoksa.org/userfiles/file/20210907112927.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/tapovebomevo.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/vetekisi.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/71553711665.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/92673094196.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/gopuroboroxibusirep.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/polozudajedamezibog.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/wotomiri.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/3677368139.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/5756fdc18533aa856a1ff54dfafdc4a2/39209964550.pdfIn PDF document text
    • http://dd-eng.com/files/files/41844491345.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/6095451636.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=android+game+hex+editorPDF 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_off0000d6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDB 10564 bytes
SHA-256: 55128b3e7addd18e32e89ebc1b36e3a13bebe8126babfdd2738ae25b32f43c93
font_02_sfnt_off0001068a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068A 17052 bytes
SHA-256: c5572652d798044c780a22801b5c5bf4fbd0a42bd9e5652a1282b219e44bf2f1

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