Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0162ba3fb3c00e6…

MALICIOUS

PDF

90.3 KB Created: 2021-09-19 03:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 25523eff49d977509335f94d3af247da SHA-1: 4efc5c0f48cb33742221dafd061df0216384ceb2 SHA-256: c0162ba3fb3c00e6647ba9489fc124ebda363650bf4b92e63b157aa954ff48f9
126 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, indicating a link farm or redirection scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a malicious infrastructure designed to distribute further content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://shopcloud.cloud/ckfinder/userfiles/files/96989251064.pdf In PDF document text
    • http://baaningdoi.com/file_media/file_image/file/lefutira.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/duvowosugikitisuseli.pdfIn PDF document text
    • https://speculatio.in/userfiles/file/jabinen.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/pixerekuzibifewusitunu.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/4218555460.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/31858914002.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210903235801552.pdfIn PDF document text
    • http://khachsanmyngoc.com/upload/files/73407824328.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/lozumewolilomelubuk.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/dikokawiwiginelululisaze.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/8183084170.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/godidugosedutakaw.pdfIn PDF document text
    • http://www.icf-plant.com/files/file/74793971972.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161392c499a1b2---vuwabaforiju.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/52343212026.pdfIn PDF document text
    • http://totoumi.jp/upload/file/sexira.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/7515175827.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/53100093745.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109021807449317.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/venal.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/36063718803.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/53344792091.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/82480006919.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93290532645.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=iphone+s+5+price+in+pakistanPDF 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_off0000ee83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE83 13432 bytes
SHA-256: 59e79aa7c7edd15ccc6312aaa23ef94fcf4d4e22c2ff4d65e5cdbba59c67ddfe
font_01_sfnt_off00010fcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E3 19756 bytes
SHA-256: 5b91273c76187e2e81bcdf693a17d966694f87603d918871919066c370a333ad

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