Malicious PDF — malware analysis report

Static analysis result for SHA-256 2be5fa3bd6e3e8fb…

MALICIOUS

PDF

75.2 KB Created: 2021-09-17 04:01:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 39b1d2af12a80d60c45f10b5317a0338 SHA-1: 586d3a5e722cd86d4dc6db53d399b61a3f691f2d SHA-256: 2be5fa3bd6e3e8fb296a3fc4d901e771522d29c282e9c03c92374ee9b2dad382
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or malware distribution campaign. The presence of external URI heuristics further supports the attack pattern of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://mt-filtration.com/uploaded/file/1915913021613bf72fb233d.pdf In PDF document text
    • http://mazraeir.com/images/upload/files/93573280725.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/43087496789.pdfIn PDF document text
    • https://aramlasmerok.hu/uploads/file/5221398162.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/63977787091.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/39d75084c33d15f5d252b6841d024a45/44241749540.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/wizoja.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/50334622546.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090304493492063.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/28532048678.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/58191616862.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109061712049517.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/kokifu.pdfIn PDF document text
    • https://12shio1.com/contents/files/25331706177.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/3dk785d0uk2t277o7sibkd2cu7/gifeboravovusibus.pdfIn PDF document text
    • https://people11people.com/uploads/File/domarafirop.pdfIn PDF document text
    • https://searches.onlineconvey.com/userfiles/file/texugefesokakamugeronukiw.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/61659407466.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/vuxoxojaraj.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210916054653.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/87998784665.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=rusted+warfare+apk+fullPDF 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_off0000c2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2EF 17172 bytes
SHA-256: 22a69b1f0081942ea7378d182bdfaeda231cba85d621fefb1b2f937c5a5a0c15
font_01_sfnt_off0000efa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BC 10496 bytes
SHA-256: 71386d96ebae56a7cc7292afc21334c38c4dec7da5912ae13aefd9b320d1bb1d

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