Malicious PDF — malware analysis report

Static analysis result for SHA-256 57ad2f7880fedd32…

MALICIOUS

PDF

70.6 KB Created: 2021-09-17 09:19:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 494cbb68cf26927c30e39842896f2a08 SHA-1: 3c4bb3137a9cb660ae8811f79b71a9d51b245ec7 SHA-256: 57ad2f7880fedd32b1bffc0572e0d2eef394b884d10688595754fb050b5126b9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to disposable hosting and employing UTM parameters, indicative of a phishing or link-farming campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a secondary payload or redirect users to a malicious site. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137cb68e09d2---xenadesuxasazerofuw.pdf In PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613effaf91d84---pavuvazuzafava.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/kitezeguxe.pdfIn PDF document text
    • https://biodez.lt/i/File/87026578920.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/porugofusu.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/79512169860.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/61896244430.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/21218926748.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/98873394208.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/nikezawebalosowepatogedi.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/26736874618.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/zowiredotez.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/mezebiki.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/lufipujigudobibarewefat.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/munukakopa.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210914_141510.pdfIn PDF document text
    • http://siamintertrade.com/file_media/file_image/file/95850294617.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-8/20210908233115694053.pdfIn PDF document text
    • http://vakaruinzinerija.lt/userfiles/file/38887087478.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/52215933574.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/25828394698.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/betilidekapinuvax.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/podiwinivev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=atari+2600+pitfall+romPDF 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_off0000b226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB226 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3D 10504 bytes
SHA-256: b4802a975b567a5f071e2c65a8df989594024c02d3aec841b4e728c84b68565f
font_02_sfnt_off0000e22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22B 16696 bytes
SHA-256: a11af0c5daf0753b2ebd8c313e59e86715e7ba80d10004f6f428b189f9d45540

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