Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0cf92afccc45e82…

MALICIOUS

PDF

69.5 KB Created: 2021-09-16 21:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e247866e0882c996ad21ae6748ae0cf7 SHA-1: 0649ccb8c249ad30675ec94d3e3f455fe0ee7c85 SHA-256: e0cf92afccc45e82401ed2d7f2f835c604cd9925cd453645318ce4e8c44a18ca
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The presence of numerous embedded URLs, many pointing to potentially disposable domains, suggests a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://dj-maily.com/uploads/pages/files/vorotadomibabawukilez.pdf In PDF document text
    • http://abovomedia.hu/_user/file/siwujiwoduge.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/69400645513.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/27076596550.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/ferugepapajivo.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/27536897858.pdfIn PDF document text
    • https://kingwrapcarspa.com/upload/files/rexuwafofomisivebaruxaru.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e014d8a383---misajuvemiku.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/12483831212.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/18013398769.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/88752761952.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/sefobusoriz.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/badugupijafijulojefu.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/9892158404.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/8606135170.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/lesapivisejusolat.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/fasulefewab.pdfIn PDF document text
    • https://csodamalom.hu/files/files/52402028972.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/72052917213.pdfIn PDF document text
    • https://soechi.id/userfiles/file/zekoludoxukamikogunetowe.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/kaxamewigufo.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/25015507114.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/50856517675.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=venom+full+movie+online+free+watchPDF 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_off0000b2b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B2 10656 bytes
SHA-256: ce77bf4f86b75886b637cc1a11c58f68f866f1dd153112a5855c99c31b0b9d63
font_01_sfnt_off0000caf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE306 14868 bytes
SHA-256: 6ad8a462b009bff6e876c176f36f262507f4bb224f3bd7cf79e66c38114f057f