Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3d29d619df09825…

MALICIOUS

PDF

82.0 KB Created: 2021-09-08 15:59:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d1183c91f4c0b2e733769b2694edaca0 SHA-1: c91503c988d84963dd591aca3943452bd013960e SHA-256: f3d29d619df0982560cb4ee2e98eaf4322a9017dfa8aa309301bb80102fc0a7a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm with numerous distinct hosts, suggesting a phishing or malware distribution attempt. Although no scripts were extracted, the PDF structure and numerous embedded URLs point towards an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://bimore.vn/webroot/img/files/52308231440.pdf In PDF document text
    • http://vaithun.net/upload/files/kelemekosudovebafemu.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/nuvedajufabag.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/waluzewegetuwawevoxiwef.pdfIn PDF document text
    • http://elverum-revmatiker.no/images/file/21567138489.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/pinuvafijudogeragur.pdfIn PDF document text
    • https://kitchensofdiablo.com/upload/file/79600692721.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/97174566147.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/de0c51acfb5b8acd5a87c39c3683369b/95267999264.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/gijopu.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/jukivixoxirejugekanelitep.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/57523890075.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/202194181044232.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/kifuloto.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/kudasudisa.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/gutewewasawapifewana.pdfIn PDF document text
    • http://pascalparrot.com/uploads/assets/file/lajofojogupafitajojo.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/dukezuj.pdfIn PDF document text
    • http://jafra-com.at/userfiles/file/jiniladed.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/mojugutimomusasewapopixex.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/vubakekuvude.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16135b57bedd64---gixuxulibotodige.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/tuvuzexebidale.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=intestino+delgado+e+grosso+pdfPDF 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_off0000da79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA79 18064 bytes
SHA-256: 587131380f920a459f495fdd06fadb4b1f20e667d6bf82d1b81bdcb5db0afd21
font_01_sfnt_off00010924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10924 10624 bytes
SHA-256: a04b11eb66d18b907cd45e803189b679fa056a3cd92e4c44c59d2ddf7ecbc0ef
font_02_sfnt_off00012157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12157 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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