Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3540a7d6f4e4d40…

MALICIOUS

PDF

70.3 KB Created: 2021-10-03 12:22:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9c8f6a5389a87573f9bde694419f055c SHA-1: a2a26edf276eea8c2a1569558bc9d6ee957fb8ee SHA-256: f3540a7d6f4e4d40809ac5354f688397b2a3b2432a7e95067d9adf2b336f55d3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to suspicious domains, and one heuristic identified it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is used to redirect users to potentially malicious sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 http://chargooshads.com/images/upload/files/rexizamurekanetafixuruk.pdf In PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/tatowuvifudiki.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/90686616397.pdfIn PDF document text
    • http://intemhathanh.com/img_duhoc/files/xawerin.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210919_231001.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/gekoredepedek.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/mogabexo.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/51460756630.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/92306310207.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/libosebejobowevu.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/72027825735.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/71531092755.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/50857062913.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/tabikawizorufi.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1614f2ddd4f8fe---69648689206.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/12158752796.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/7575724480.pdfIn PDF document text
    • http://nfc.soo.jp/file/tumewaxuvenede.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/pawaresodij.pdfIn PDF document text
    • http://4bx.pl/public/file/fotabenolotaxujexasaradu.pdfIn PDF document text
    • https://telenovella-bg.com/files/63001286466.pdfIn PDF document text
    • http://burfel.ru/upfiles/files/98597810765.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/98992086994.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/dodedokigiri.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/womakawod.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/rafedosojefuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=video+gay+tube+malePDF 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_off0000b1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BF 10540 bytes
SHA-256: 6d4168ed597c569e76ba6354aadff1a75ba4de7591b5766a2649acb36db9e61d
font_02_sfnt_off0000e191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE191 16352 bytes
SHA-256: 38234b98ed7b7ced40ed9ff9d7fc75ff725294fba1efcbe9936caec8e6aaf674

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