Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e2cdc420b5a963a…

MALICIOUS

PDF

70.1 KB Created: 2021-09-25 12:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1cb248a3678918f58daeee4581044e6e SHA-1: f5fd8e44e1e390bf9c6e4f53885d94ef0b8bbda1 SHA-256: 7e2cdc420b5a963a24383abd9f87caf93725f3cfd63ede4906f939ac8265094b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it functions as a link farm, directing users to numerous other PDF files hosted on various domains. The presence of multiple unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://rosycaffe.com/file/45897289007.pdf In PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/b14d0ebb7dbb8750f52badb74422e99b/50372010515.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-9-13/20210913010256876875.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210923151912.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/65170735194.pdfIn PDF document text
    • http://www.puhito.hu/uploads/kirazivevedoxusowido.pdfIn PDF document text
    • http://tedesco.pl/userfiles/file/ketekug.pdfIn PDF document text
    • https://olterus.net/contents/files/faloj.pdfIn PDF document text
    • https://mklaassen.nl/images/file/67018036946.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/86659939001.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/taxenutalunejin.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/posevugutiwivuzorol.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/88977578311.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/44018432909.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/59588558788.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e928a67ec9---lakodupageruxet.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/41774829418.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/jexolidebonewu.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/47949171574.pdfIn PDF document text
    • https://pacpartner.net/images_client/imagesfile/wavawisirobozo.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/15425333928.pdfIn PDF document text
    • http://ptk-tent.ru/userfiles/file/44108453196.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=mba+vocabulary+list+pdfPDF 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_off0000ae33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE33 17628 bytes
SHA-256: eafdf361a07480da6d550bddb85c2289902cd5206ce9428042a3941b700e4f42
font_01_sfnt_off0000da47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA47 10792 bytes
SHA-256: 23d3c523537cf7f0eb977fe628993e8f6b59195b1bf15cef81a3c158a321d76d
font_02_sfnt_off0000f328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF328 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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