Malicious PDF — malware analysis report

Static analysis result for SHA-256 51bc981d5b071479…

MALICIOUS

PDF

82.4 KB Created: 2021-09-18 02:43:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b25dfbeb4c23563f88268530722046f1 SHA-1: b11001ddc2460195ae83e43f5c32154160f8d080 SHA-256: 51bc981d5b071479be1a624f0e0f58a1f3c5923c0aab391b985bc755ce2b1504
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, with one heuristic specifically identifying it as a link farm on disposable hosting. This suggests the PDF's primary purpose is to redirect users to potentially harmful external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://eskuvoiiranytu.hu/blog/file/memokevusabuwus.pdf In PDF document text
    • https://melnikhouse.com/userfiles/file/43231079715.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zevafirugabepu.pdfIn PDF document text
    • https://funke.be/data/file/jevowu.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/lakoxurosusa.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/40269936913.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/petokukofabiwuf.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210915_3477BD015167C451.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135054781f67---vasevexijuropajamezes.pdfIn PDF document text
    • http://qdjshg.com/files/file/zorewozitinexewiwiwakemot.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/80823288960.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/fevaboronoxulut.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/lirugow.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/96366307754.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/bozezoma.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/rapivedajexifafoguwumubi.pdfIn PDF document text
    • https://expomediainc.com/upload/file/13754987835.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/babumetukelolojorito.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gujimizigokaxewelekalilo.pdfIn PDF document text
    • https://mahae.hu/files/files/kobilax.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f039815bc---76023001442.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///68971964971.pdfIn PDF document text
    • http://dalaichau.com/files/8164169408.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/netafegixubeba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=mi+box+firmware+downloadPDF 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_off0000d992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD992 10572 bytes
SHA-256: bc6711c19ad5a23d055f332fb14eb3282cc50bd45a31b4212b90629c664cd42a
font_01_sfnt_off0000f1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B2 19264 bytes
SHA-256: 6b6342fb3f3a8fd736d29b13f62b9bd92e51c50327c5cf1b1a26fd2bf9ed0fa8
font_02_sfnt_off000123c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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