Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c981679a75774d0…

MALICIOUS

PDF

84.3 KB Created: 2021-09-16 07:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1691faabef6f52bf9eaa31dc1534ceb3 SHA-1: 4669e816d9836a1632028170400e9bce660cca47 SHA-256: 3c981679a75774d096c775bd8254b1694ee8ee86fd2bf95fe54fc849dbd7a10e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://catamma.ru/uplcv?utm_term=app+locker+android+github PDF link annotation
    • http://roomyab.ir/basefile/roomyabir/files/50177915207.pdfIn PDF document text
    • https://scalping.ir/data/files/file/kuwerigizekenepipojezelim.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/fovejupumumu.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/kenamujekipivodus.pdfIn PDF document text
    • http://palami.by/images/file/fetatisifosurobevuwataf.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/mapisubejedeg.pdfIn PDF document text
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/joduxizepedovo.pdfIn PDF document text
    • http://rc-modeller.se/images/file///kozokefenununiseverewub.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/60510532693.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/gatuxakafudoguguj.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/sodesipugibenelevuragozu.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/6800073055.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/lapisovibelazoda.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/buzuxa.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/28900365422.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/xatosogedinopotedidoje.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419a89b8d47---zulepetilalirotoremopuxig.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/b7a33f5e0505902a3d9d0ea4fbdaa40a/nagorarutololuw.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/nipajomazibiwofokajimuf.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/mofofu.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/18346009049.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/rexudiwisalarufubolozavut.pdfIn PDF document text
    • 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_off0000e43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43F 18056 bytes
SHA-256: 31d80b924f5de1972833a012035f4720c19e3a79dadc136315aabd9849df1be1
font_01_sfnt_off0001130d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B24 10936 bytes
SHA-256: 7cdf94889a99c347702df8a1df8e284c0624f6c70efe8ab559e8d30070445584

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