Malicious PDF — malware analysis report

Static analysis result for SHA-256 56e899106a042199…

MALICIOUS

PDF

82.0 KB Created: 2021-09-10 05:28:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1c846fff62795e0f78ee5f022d0e3c0a SHA-1: 909175d014494531c3531e63409bca3b7ee485ba SHA-256: 56e899106a0421991465e5d80294ed7f7b22a74519cf1618b76438652f73978f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, containing numerous external URLs pointing to potentially malicious content. While no scripts were explicitly extracted, the PDF structure and the presence of many unknown-reputation URLs suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://brickchamber.com/ckfinder/userfiles/files/88547745118.pdf In PDF document text
    • https://panoramamall.bg/ckeditor/ckfinder/userfiles/files/monasumin.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/rimaduxixobuno.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/satibiragavobido.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/8cc2cbd291d88c87c03259f65cc9bae9/refedororiz.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/rezatapigelipitowelizuri.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/681662586.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/pawatorevemevaboxidis.pdfIn PDF document text
    • https://bipalisdemo.dashindonesia.com/userfiles/files/wupizubujub.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/zurevutozod.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/83617649026.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/babef.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/jopugixogiriwezewit.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109071804142804.pdfIn PDF document text
    • http://195exim.com/datas/files/29832944742.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16135b8b20c842---sesilositowoko.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/jojugedibuwe.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/jiwomo.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/fowizebunutos.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/xenebeb.pdfIn PDF document text
    • http://ondamarinarest.com/upload/files/45119720009.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/23262163152.pdfIn PDF document text
    • http://cissi.it/userfiles/files/nuzigafajamiludekafanuve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=ffbm+mode+exitPDF 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_off0000d32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32F 21912 bytes
SHA-256: 7f6af4ca566dd3e3389c3066e9731884ca4e45eb36297e01e679410c67adebf0
font_01_sfnt_off00010c6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12484 10156 bytes
SHA-256: 07e5b23391398ebad446f5346b9fb6f60c9b44ea9d39883d902d2c245c948ad5