Malicious PDF — malware analysis report

Static analysis result for SHA-256 a22e83e86811e062…

MALICIOUS

PDF

92.9 KB Created: 2021-09-22 11:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 4ea7b4de85cc0547c898cee068d0d26e SHA-1: 501ee795b09d7e0f7af9c9e33cde7a35a11d6f22 SHA-256: a22e83e86811e06284d0fca83e7834b3361953c7343ce12adf0f5b5fbd7680d7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a large number of distinct hosts and links, further supporting the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396bfbdce77---78263099277.pdf In PDF document text
    • https://wic-net.com/userfiles/file/21099191207.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/xinonosorezux.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/98635896301.pdfIn PDF document text
    • http://www.hkimm.hk/_bin/ckfinder/userfiles/files/segob.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/30885876326.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/77079405040.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/84185943129.pdfIn PDF document text
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/falegebotika.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/32969068956.pdfIn PDF document text
    • http://africareview.in/userfiles/file/95769471451.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/mujagumani.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/putomosejegiboresewi.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/8303889359.pdfIn PDF document text
    • https://cooperadora.grupocreartel.com/documentos/archivos/22110687700.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/vaxigugepovududukalitirad.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/11655654507.pdfIn PDF document text
    • https://maciejabramowicz.pl/upload/files/file/66854932232.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/faguvesos.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/popew.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/97131445623.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/dexemagixitimazuruxexejaw.pdfIn PDF document text
    • http://wenyanchem.com/upload/files/wadefozekigidolilejaz.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/tonorunokudutekugo.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210903210528_2038738389.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=pokemon+go+location+spoofing+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_off000103d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011bf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF0 11056 bytes
SHA-256: 850e1361aa401ca2e72063dcbac8b6b3cdf457dd9c863c562cd29a0e2617f93e
font_02_sfnt_off00013575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13575 18532 bytes
SHA-256: 86bfd45829ff3c4e34d19dc8407eacc54731d6826de60ce37409e62341c3c499