Malicious PDF — malware analysis report

Static analysis result for SHA-256 528d80f09075abd4…

MALICIOUS

PDF

90.4 KB Created: 2021-09-16 18:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5ee78ba9774e2f79dae768e98d7d3799 SHA-1: 6350e87fe5e7471906b2e5052b069c556374ffbf SHA-256: 528d80f09075abd457e263cae35b757b0c600984dbd285f5d68e1eda74e66081
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with one specifically identified as a link farm hosted on disposable infrastructure. This suggests the document's primary purpose is to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://badgerhillfarm.uk/febolarafujerel.pdf In PDF document text
    • http://usatovl.ru/upload/fckeditorfile/29958947477.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/95226469901.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/taruneliwup.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/pobiwukelined.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/47909596651.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/xetudi.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/62903677334.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/rajojopaxofopu.pdfIn PDF document text
    • https://makenie.com/upload/files/7610579602.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/jekuvumutuzalujefej.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/batori.pdfIn PDF document text
    • http://tfforming.ru/d/files/99591394404.pdfIn PDF document text
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/wonaxo.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/52807707855.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210914_EB45DDF7D6225067.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/39775058290.pdfIn PDF document text
    • https://mollis.rs/files/72365133637.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/56651127785.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/34476010154.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/wunugubaguzegoza.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/42606843129.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/24995845565.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=dragon+ball+z+broly+watch+onlinePDF 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_off0000f805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF805 19392 bytes
SHA-256: 7034448fd54c264e577bb866b548cf6122d580a4f9fa790f3c1cb988d8891a81
font_01_sfnt_off00012b36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001434d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1434D 10744 bytes
SHA-256: ac85fc2fc300734a612c93f8ac0c63d2f905f5e9d438b49d55f8db17c1cf4d16

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