Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebbf5ca1d60d2586…

MALICIOUS

PDF

69.4 KB Created: 2021-09-17 21:48:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: d7113055b1d2ed89828ff3da1aefe807 SHA-1: 09a24fe339d57524246dee6360bcb5b0496a8b94 SHA-256: ebbf5ca1d60d2586d92a439b563dd5ac3c70d37939d131ff0fdffce3989120bc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including ML and ClamAV, as malicious. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm designed to redirect users. The presence of external URIs and the link farm heuristic strongly suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://pixomot.ru/uplcv?utm_term=gta+3+1.3+apk PDF link annotation
    • http://accronline.com/userfiles/file/64490518234.pdfIn PDF document text
    • http://metall-press.ru/files/48164087436.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/vezonurulebodunabuzixev.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/60760539325.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/sijulolotubelof.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/mesosanogavapasiwobeti.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/86212549738.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210904/file/16306885315582.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/tesuwu.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/wemogejoma.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/sivadazatix.pdfIn PDF document text
    • http://elsped.hu/files/file/65721838525.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/41500531478.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/bugib.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/30802223482.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/65582212854.pdfIn PDF document text
    • https://semut73.com/contents/files/vupenak.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202109162134057974.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/41892600777.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/gorexujixunaxurukivuvu.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425d89e567e---80318603719.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_off0000ace4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACE4 17780 bytes
SHA-256: 9c8f08fc69c64b78232369e0c9fa79bc4094f3c7435096a24d81e4612d667ee8
font_01_sfnt_off0000dabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D4 9904 bytes
SHA-256: 0efe84c62fc6f97593759b18c790d2d8e5763d941551a369bea59990149f02a7

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