Malicious PDF — malware analysis report

Static analysis result for SHA-256 427e6c56d9005854…

MALICIOUS

PDF

82.0 KB Created: 2021-09-12 05:34:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 14c9af8be44ed8b4f9d16001cd1ab5fc SHA-1: a94ea9fc04bc2dbbeb8b33f602974e56abf63cf4 SHA-256: 427e6c56d90058542754b4ca1a5d2ecd8961ee0d23bd37731d85acddbb1f41ee
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. Heuristics indicate it functions as a link farm, directing users to numerous distinct domains, many of which host PDF files. The presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kramor.bg/userfiles/file/37574835022.pdf In PDF document text
    • https://luckysurface.itweald.com/uploads/files/6138b9aa89574.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/jawobok.pdfIn PDF document text
    • http://vodnik48.ru/content/file/besekolibot.pdfIn PDF document text
    • http://citra.cl/userfiles/file/74398163463.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137910b14ea4---6661401627.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/96736191464.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/migupe.pdfIn PDF document text
    • http://steinemann-ag.ru/dadubigoxemazotax.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/luluxelajupumoluseb.pdfIn PDF document text
    • http://alocainghien.com/uploads/userfiles/file/40756285935.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/68626013848.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210902142433.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/17219500242.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/2651012934.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/26828233667.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/zalasavoxaxowutovuf.pdfIn PDF document text
    • http://peak-experience-europe.com/images/blog/file/rimanadibiwepizekadutor.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/rurezakowisaresabuvi.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/wedodanavid.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132dfd7eb33e---numib.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/90977891471.pdfIn PDF document text
    • http://domuran.pl/files/file/pubatepuvazirepinekos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=video+editing+for+android+freePDF 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_off0000dec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC6 10284 bytes
SHA-256: 10492f41eb8c696456e15bd07e663812e84101bce293d48069ac04739a7e5a8a
font_01_sfnt_off0000f5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE7 17168 bytes
SHA-256: d3ed52ac99679f10bd628dda1f90bb90754ed1475666bccdf2ebfaac976338e2

Open this report in the interactive analyzer, or submit your own file for analysis.