Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2341b757843b9e5…

MALICIOUS

PDF

72.2 KB Created: 2021-10-03 14:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 47d5e5da8d682c7297f3df9b264d53c3 SHA-1: 6609fa9df416cf1f48740ae5260895a2f3038772 SHA-256: d2341b757843b9e5886583f5bd7eacd6d9881208e0a82ce022fd0fbb99ef4059
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 a large number of embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination or distribute malware through numerous small PDF files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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=convert+40mm+to+cm PDF link annotation
    • http://hongdacable.com/d/files/zuwepafexunoguzom.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/60727454013.pdfIn PDF document text
    • http://peoplefoster.com/pliki/ragoxopo.pdfIn PDF document text
    • http://xn----7sbndn5at.xn--p1ai/uploads/files/pegonetew.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/netir.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/desotugebafudutavufikewix.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/95705146267.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/38519406876.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/ledefutowabadokin.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161562406358fc---nepiritaviwes.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/posixepikusajewagapugujen.pdfIn PDF document text
    • https://emenu.hu/editor_up/xakukedisepe.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/4080064131.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/pupele.pdfIn PDF document text
    • https://durimawar.com/contents/files/3398937207.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/kabavemokowajilozunufober.pdfIn PDF document text
    • http://vibratingsieve.com/d/files/zuxizegaseweri.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/7b4b11df4d9b79ee08c8518b9e26786e/91579056047.pdfIn PDF document text
    • https://geloracinta.com/contents/files/zuxelaxufimalixenibadaju.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/kekukegazobixof.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_off0000b6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6EE 17856 bytes
SHA-256: b2b9ccc5dfe668a374a5323297a596d9fa091e02c11ce95bfa0de699425f354c
font_01_sfnt_off0000e4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D3 10220 bytes
SHA-256: 27e527ba927bf82409ea087b0712f6dd8a646c5b1be7258480e98cc8ba726166
font_02_sfnt_off0000fbcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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