Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ce4f2992be811de…

MALICIOUS

PDF

73.0 KB Created: 2021-09-14 05:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 05255007c7490b2c5e69ce7d45f7bc8f SHA-1: ae3fe016956e06a8d4ffad08a0442ef7e0e38818 SHA-256: 6ce4f2992be811de302c944b9695ffbf4736619aab8f7689d11a234a15fa359f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous external URLs, many of which are embedded within the PDF structure, suggesting a phishing or scam lure. The PDF's metadata indicates it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content, further supporting the idea that it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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 https://crysiq.ru/uplcv?utm_term=sportz+tv+guide PDF link annotation
    • https://episcopiaoradiei.ro/files/gukizirifesefamonunona.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/lebid.pdfIn PDF document text
    • https://harmony.im/userfiles/file/84156471414.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/navadujetixofofubi.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021951356303490.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c212bc8702---25523433566.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109100710592540.pdfIn PDF document text
    • https://toscanafantastica.com/userfiles/file/84277013246.pdfIn PDF document text
    • http://fabtur.ru/upload/files/43519961439.pdfIn PDF document text
    • https://mobilpetrol.olajpark.hu/files/files/97268510457.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/kijopojuj.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/beranunoriwezimefajolop.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/91647253809.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/jojozewafotaxofaxijinaj.pdfIn PDF document text
    • https://akconta.com/uploads/files/bojoraxutakumaxep.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/57958460030.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/13611566120.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/3ee348e6d68556ebd91d1221834fc326/vozawonalulog.pdfIn PDF document text
    • https://pbanerjeeservices.4digitmagic.com/userfiles/file/18515606867.pdfIn PDF document text
    • http://goldmustang.ru/files/files/22968728031.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///bekevotu.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/zuvawowalaw.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/14485473311.pdfIn PDF document text
    • http://beganijewellers.com/ckeditor/ckfinder/userfiles/files/gekutudomowosi.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/94510803914.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/43872654374.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_off0000bd36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD548 16188 bytes
SHA-256: f21fa33328eb861892830e839645da7a81f3858e50b6e627b10738bce0cd4f88
font_02_sfnt_off0000fef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF8 10388 bytes
SHA-256: ba979a3cb88a77477cc1d0b10b1b8788f683ae465283dadf6aabd9736dbd4eb8