Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1b2df7e7485587a…

MALICIOUS

PDF

82.8 KB Created: 2021-09-24 07:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3691da0af3b935af21cc1727df7ad919 SHA-1: befe081818a8649aaf8c87bd085b685050ced17c SHA-256: e1b2df7e7485587ae6e85077478849dabe1634341f3000cdec984c4d2796d3a3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to external sites, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it is designed to redirect users to potentially harmful content.

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 https://hagakure.by/upload/editor/files/95369920544.pdf In PDF document text
    • https://mmtours.si/uploads/66247749541.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/62217658979.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210904/file/16306913015373.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/fejexalilowekadopiza.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/90620801668.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1632440807.pdfIn PDF document text
    • http://zl369.net/userfiles/file/pajidadefox.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/3727142180.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/37774618309.pdfIn PDF document text
    • http://amandamaitland.com/images/file/71150371676.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/81726077101.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/zosevimojesixase.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/51347363084.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa2d0bf702---7774464637.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/72294350309.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/pusaxagefufanudagofonuwod.pdfIn PDF document text
    • http://iucecb.com/files/file/laluwe.pdfIn PDF document text
    • http://pk-rowery.pl/user_pict/file/3314134397.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/jajigikigexuzomok.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614702acbeaf7---28846537933.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/82048130003.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/86165556667.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+increase+graphics+in+androidPDF 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_off0000db74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB74 18856 bytes
SHA-256: a2526ecd381f0cd8453edd59ea620a8f5dde5391201a24e4b6cec415eeaaf593
font_01_sfnt_off00010caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAF 10824 bytes
SHA-256: 4331cc0ff468af0f2470ebaafc2eb663c49a7f082dc16cfca73348f64c4199f2
font_02_sfnt_off0001256c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1