Malicious PDF — malware analysis report

Static analysis result for SHA-256 5030880bc16db48c…

MALICIOUS

PDF

68.4 KB Created: 2021-09-30 11:10:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 80da3ba30fe003508b7f52a21711451c SHA-1: b8929b586ec4ca5a621e6acb3eff37034ab93de1 SHA-256: 5030880bc16db48c27531b70e11a8e7e9b4cf80765f1451544a6c97884396276
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Numerous external URIs were extracted, many of which point to disposable hosting and appear to be part of a link farm designed to redirect users. The presence of embedded URLs and the heuristic indicating a link farm strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://krisoc.ru/uplcv?utm_term=offline+gun+games+download PDF link annotation
    • http://aaykpn.com/uploads/editor/files/wusuvazimebuvoxomisize.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/dolefisojolet.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/26820748228.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/fopedu.pdfIn PDF document text
    • http://dd-eng.com/files/files/1937859645.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/rovadepotofo.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/89768603143.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/55072314832.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/26695590028.pdfIn PDF document text
    • http://dongbanja.com/userData/ebizro_board/file/tebufolupisarofoxapudapo.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/85155900155.pdfIn PDF document text
    • http://katachizu.com/img/news/files/fevum.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/duzasuxokamisomiv.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/fezotosobavabinosivut.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/fexoniguva.pdfIn PDF document text
    • http://melvin.cz/data/68370892609.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/161529b5e23634---vufamuve.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614906a07ee32---vutovodu.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/moluwopaseretud.pdfIn PDF document text
    • http://domario.ru/userfiles/file/36962743481.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/48142538170.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/gufewaziriwusi.pdfIn PDF document text
    • https://titishop.co/upload/files/kuvakedijik.pdfIn PDF document text
    • http://xn--80aer5aza.xn----htbdepbihnfb8cyg.xn--p1ai/ckfinder/userfiles/files/jigorosakakomakif.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_off0000ae6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE6D 10712 bytes
SHA-256: 57947059db432cfb26ee1864dcbd72ae109c3ee331c8443444ff0fae5392a01c
font_01_sfnt_off0000c6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000deec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEC 14756 bytes
SHA-256: 918ca4733cc5352c673a65fed88665e18c4dbe39a11628731f0cfb38428ee7c0

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