Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdfe1d8b8b613579…

MALICIOUS

PDF

74.5 KB Created: 2021-09-12 11:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6e0092f0c314cb4e08bbb9d961756c35 SHA-1: 259b47cddd83ce2a269ca0239c8c692f0897219d SHA-256: fdfe1d8b8b6135798251ee8be864b9af6ee84f7321d8dfc042b633d553823205
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm, a common tactic for phishing or distributing further malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document's primary purpose is to redirect users to a large number of external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://huntic.ru/uplcv?utm_term=cordova+add+android+platform PDF link annotation
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/dujavifetubilugido.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/7036404349.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/kidam.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/koxazasevuboveri.pdfIn PDF document text
    • https://olterus.info/contents/files/gerigurisetabujiladokiv.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/7870574999.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/51254761329.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/durutovufulil.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/99364049132.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/tepolexinizobe.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/dutijemolamuguxilazatesid.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/b9cd564f37851e16ea9cc55485d90897/potejononudasesaja.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/tefudujesumakiser.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/60001372414.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/nesigowiguxo.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/webirunitavebamufirubud.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/wavekasikaxukijax.pdfIn PDF document text
    • http://speckrepej.com/upload/file/46109105059.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/tujokosobegiwivafusexaje.pdfIn PDF document text
    • http://jodhpurheritagewalk.com/images/file/tepusunoruni.pdfIn PDF document text
    • http://fthyhs.com/resource/docContentImg/file/2021-09-12/d855014d8f0dc35154f0be4b100408bf.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ade314729---kudikivuz.pdfIn PDF document text
    • http://sigmabhp.pl/userfiles/file/xokodidigew.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/sevutolub.pdfIn PDF document text
    • http://kwartetproforma.com/userfiles/file/tipogafovozig.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/2816922367.pdfIn PDF document text
    • 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_off0000c054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC054 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD866 16936 bytes
SHA-256: 20a51652ebf834238f26cfc0bb9cdc79e00762545ee622ff7b95dce7c328165e
font_02_sfnt_off00010483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10483 10456 bytes
SHA-256: 586587a7fc3c895ee1b63e7194a2e2b65df9b4ceba087283d998fa17716c863b