Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f6dfde6619b015b…

MALICIOUS

PDF

81.5 KB Created: 2021-09-11 23:24:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a6f6978ef751b1fb84f1248c23e02992 SHA-1: 6a4f9b6f4485daef626b026fea2d446ba2301908 SHA-256: 4f6dfde6619b015b5e13d57ae91dbac4b5250ede0f559ca0c3473542c151f034
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to potentially disposable domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to redirect users to multiple external sites. No scripts were extracted, but the presence of external URIs and the link farm heuristic strongly suggest the PDF's purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b035a80a48---monepuwepodopasolefop.pdf In PDF document text
    • http://northmarking.com/userfiles/files/polijab.pdfIn PDF document text
    • http://jump360.co/upload/files/20210910105857.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/26093369298.pdfIn PDF document text
    • https://loyd.rs/images/file/34552496182.pdfIn PDF document text
    • http://checopharma.com/upload/files/67636725194.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/zajoxelon.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/disagaduz.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/gusixivepexezuwinetila.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/xijibepitamiwupibitus.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/39624805164.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/vaxoxame.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/jisexunol.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/jibolabazo.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/74486863355.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/gukijetopozaxir.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/tegafevupibod.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/ginunotapuwugovubevex.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/wesomesabafaruk.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/80870446458.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=hollywood+horror+movie+appPDF 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_off0000d79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79D 18592 bytes
SHA-256: db3dae31db4f9c8ccb4614d01ff12cd6d3b9a52dd937156010ebb5ae75dedf37
font_01_sfnt_off00010841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10841 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12058 10544 bytes
SHA-256: 61aea6dd9b648b5ddc01408ad9def0da612637fcd52812c82e97ebb2b22c0e53

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