Malicious PDF — malware analysis report

Static analysis result for SHA-256 da2d7a375e519c26…

MALICIOUS

PDF

83.5 KB Created: 2021-09-08 21:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b10ce01f4aee58369b9b244aa0329802 SHA-1: 18138ffbc77f9a12df71bba1014059210292f082 SHA-256: da2d7a375e519c266a7f405937b31fb6244d441385e82e177109b68e618c8202
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, many pointing to disposable domains, which is characteristic of phishing or malware distribution campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content, likely as part of a spearphishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://mehreganimaging.ir/images/upload/files/47633833170.pdf In PDF document text
    • http://ourgans.org/userfiles/files/92237168858.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/gisagipowibazodarilibixe.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373c013c072---3567866715.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/13477885859.pdfIn PDF document text
    • https://alev.az/userfiles/file/84961609869.pdfIn PDF document text
    • http://winso.tw/userfiles/file/rumugebonowabigerumererel.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/39993819788.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/jerajasotu.pdfIn PDF document text
    • http://vector-food.com/userfiles/file/53066528343.pdfIn PDF document text
    • https://cncunse.com/d/files/87299191865.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316dca4b268---63697625984.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/kokarofifisosajuliv.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/23291077335.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/widukiputuvamokimul.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/21908457311.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/73901047382.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/zovobijimagujipixejoba.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/lixez.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/jugasadawesevevikaxor.pdfIn PDF document text
    • http://craft-personal.de/userfiles/file/nebovutitofupijonaxuroxa.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/23894129691.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/10046662532.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/kipuwi.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/kuxilalixozuxumikufidebod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=tom+and+jerry+the+bodyguardPDF 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_off0000dc71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC71 20004 bytes
SHA-256: 39ebbf7779c76b68ff541a6f50597c306972ed2f5fdbfeaab0f223c7281fcb8d
font_01_sfnt_off00010fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C7 10836 bytes
SHA-256: 4bee3c19d79219bec8bfcbce666484520197b60185fe49cbb1d61ec0048e018a