Malicious PDF — malware analysis report

Static analysis result for SHA-256 6efb7986e387b57d…

MALICIOUS

PDF

79.6 KB Created: 2021-09-14 04:17:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7eff3c68b6fe16daf1f51ee35e3d4d2e SHA-1: 7fd77925268d4d7148c70933bc15f62182ee7626 SHA-256: 6efb7986e387b57d210ec4ec4962b4b7fe9b89fd5d436701efc69463118b5925
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://marblobathware.com/app/webroot/img/files/mujefufijexubososikeraza.pdf In PDF document text
    • http://progetec.org/userfiles/files/64680820086.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/boxupofebapa.pdfIn PDF document text
    • https://eslms.com/userfiles/file/pifapomesigavuvigiwo.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/vuwovimebifepilibomafafip.pdfIn PDF document text
    • http://dfanchem.com/upload/files/toxezuxigoxogadovi.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/jekutipodi.pdfIn PDF document text
    • http://votejoedestefano.com/editorData/file/89632046041.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138940343d17---8956944177.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/29851169666.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/luzipipo.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/45455402472.pdfIn PDF document text
    • https://xn--90aweabvm.xn--p1ai/ckfinder/userfiles/files/lonog.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/webelib.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/4d203a8199b84bdff907f373d47ae5fa/nitaro.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/76842403337.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/73199373920.pdfIn PDF document text
    • http://comitatoamiantovelodromo.org/userfiles/file/96173177097.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/wimawizuz.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/makiwenogulaginedobarazox.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/98021903409.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=debian+how+to+set+static+ipPDF 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_off0000d493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD493 16996 bytes
SHA-256: b79ac15ed81a9be914fe578b29a7d529c58bd967870f8e41c9e8301c97d94bb6
font_01_sfnt_off0001013b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11952 10552 bytes
SHA-256: cc6ff8cd9016c7640da8a28c4308125edfcc7ceaf9e145f5d48d38f741a87b23

Open this report in the interactive analyzer, or submit your own file for analysis.