Malicious PDF — malware analysis report

Static analysis result for SHA-256 927e1740643b59bd…

MALICIOUS

PDF

83.1 KB Created: 2021-09-22 11:15:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 79c75b3c6a4a90d2d31940fb22e89f67 SHA-1: 614a9403022ae39ec5f9d11a0d212269ddf6d60d SHA-256: 927e1740643b59bded3135bb73165b85140a498a0e88b8938e7296d0c4e440aa
146 Risk Score

Malware Insights

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

The PDF document contains a high number of embedded links, many of which point to disposable domains and are part of a link farm, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, providing no direct textual clues, but the heuristic findings are sufficient.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://thuexedanang247.com/uploads/image/files/xefoduline.pdf In PDF document text
    • http://michalpavlicek.com/uploaded/file/xejukokeferu.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/21418608862.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/25575552374.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/71341468543.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/42382410494.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/pujojij.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/11e6474fee2ba2b3bc8ecfe29a714c65/81596339303.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/gagesogosobusejoli.pdfIn PDF document text
    • http://hmsendo.pl/uploads/editor/file/sibebebijonafizifom.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/fogosotatimaxolewadi.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdd92133ab---fosusaminodavixutufop.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/wiwularupekelorudovo.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/94064197546.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/85716807560.pdfIn PDF document text
    • https://onecre.com/images/content/files/figagen.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/1bd59b29357e89fc737354d2653a9617.pdfIn PDF document text
    • http://jin16888.com/userfiles/file/xikidemigir.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/lifuvedusatutukapu.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/nakolekojidowusel.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/32154823743.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/61985981182.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/36571631616.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/resazuxasur.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/pufufamupusogow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=download+game+truck+canter+simulator+mod+apkPDF 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_off0000ddc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC5 17988 bytes
SHA-256: acfc73ef1ebf3e3f1ce008de6af3e08f8752a57562f2d3ccb6f5b8d1c60a5a80
font_01_sfnt_off00010c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7A 11136 bytes
SHA-256: 743c51b63c76feb1731e0fe03aebac193f5f912e7a7cf654f63a084a43128f1a
font_02_sfnt_off00012655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12655 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1