Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7f95beccf5df460…

MALICIOUS

PDF

80.1 KB Created: 2021-03-29 16:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 82bc4a39711f095b0bfb84c5e5743653 SHA-1: 696c5b20e14fb154bac2f39df201b39e87fb2c36 SHA-256: c7f95beccf5df460feb02d5813b88b6aab83b48e8a18a5b51621f0683b74f095
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are dynamically generated and point to suspicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/strik?utm_term=how+to+remove+stuck+staple+from+staple+gun
    • https://cdn.sqhk.co/bamebuxi/djc9OsW/wumulukuxakev.pdf
    • http://manuximaxemeje.scienceontheweb.net/dodosararabijogusukata.pdf
    • https://pakipuxis.weebly.com/uploads/1/3/5/3/135347710/7657732.pdf
    • https://cdn-cms.f-static.net/uploads/4474992/normal_6037d0b613239.pdf
    • http://bidimiw.sportsontheweb.net/zawazafagoku.pdf
    • https://cdn-cms.f-static.net/uploads/4490754/normal_6020614cc3e7f.pdf
    • https://static.s123-cdn-static.com/uploads/4485308/normal_5fee468483667.pdf
    • https://bajarewejewud.weebly.com/uploads/1/3/4/6/134673735/5502218.pdf
    • https://cdn.sqhk.co/dijabidasu/ihetgga/53637704024.pdf
    • https://cdn-cms.f-static.net/uploads/4415740/normal_602b490bba826.pdf
    • http://bogipeborowe.sportsontheweb.net/73336199380.pdf
    • https://zokutiwako.weebly.com/uploads/1/3/0/8/130873782/453218.pdf
    • https://static.s123-cdn-static.com/uploads/4491925/normal_5ffdecf646e64.pdf
    • https://migawonakizize.weebly.com/uploads/1/3/1/6/131637147/puzojenidoralajojuw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lixasifasi/avatar_the_legend_of_aang_comics.pdf
    • https://s3.amazonaws.com/megodipewukitoj/bailaras_punjabi_movie_all_song.pdf
    • https://s3.amazonaws.com/lezerawe/insider_report_definition.pdf
    • https://s3.amazonaws.com/defujo/measuring_length_worksheets_grade_5.pdf
    • http://keregimuw.onlinewebshop.net/ejemplo_de_dialogo_en_ingles_y_espaol.pdf
    • https://s3.amazonaws.com/ponivotigegepub/77727639525.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb95.bin
f8a64f972d3a444e78d29035b44456c1e45d0f9ed79da5408eca3f5a43f21d79		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB95 5512 bytes
font_01_sfnt_off00010e60.bin
d6aa70c1bea37b12510e93436430709bd515fe7dca02d860f191caa7ae0a933d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E60 10816 bytes

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