Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ec7b4a3911b287a…

MALICIOUS

PDF

70.0 KB Created: 2021-09-30 18:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4fb1d37a2e505be08931e333ad65e5bc SHA-1: 07d5ef855209a5edd19474904bdcbf29f41f9831 SHA-256: 0ec7b4a3911b287ae7e437fd79e65dadebdaa6eda604db822452ad2ea8332c23
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which point to PDF files hosted on various domains, suggesting a link farm designed to distribute malicious content or phish users. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/uproesk0qfrm2bmkhq8rqk3cr1/jomituzewa.pdf In PDF document text
    • http://assotechne.eu/userfiles/files/tubuzupedo.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/vopemisorepa.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/gamatazajomezimedefegekij.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/4859254251.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab868a3b03---45988834872.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/makodufexetufasaguxotuviv.pdfIn PDF document text
    • http://skupka54.ru/upload/m/34909982433.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/68594907788.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/65748981443.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210925_A133FA66DE60122A.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/sotelenumazegipaxase.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/fimuriwuwovuxupiripafuw.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/mibitazarusojosof.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/93225367452.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/69248090917.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210922165654.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/16222557217.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/14408635964.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/jekowizirof.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/95580538703.pdfIn PDF document text
    • http://pololanna.com/user_img/files/98983456883.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/94682482049.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1631208097.pdfIn PDF document text
    • https://keongracun.org/contents/files/18793628200.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/62254898340.pdfIn PDF document text
    • https://tivirtual.com/userfiles/file/boxamalofuvedekimokor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=pokemon+online+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_off0000b241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB241 10140 bytes
SHA-256: a355a37391b991815244189d4e48f2bf2967186cfa6eba1e27579a699384aa0d
font_01_sfnt_off0000c8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E4 16432 bytes
SHA-256: 1ff868fa508f8e114ba90f302575ef37201897546c3d8a3d8e6c1c14aa3fc3e1