Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab5df2254f6681a2…

MALICIOUS

PDF

90.7 KB Created: 2021-09-17 22:31:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f091d03f346d515a2f4bd683207de253 SHA-1: 6b8c2e5630aef794b9b28752da91af7b8f3a40d4 SHA-256: ab5df2254f6681a26c148a0070951b7e456c866199a3f651743e899f522d367b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs pointing to various domains, suggesting it's designed to redirect users to potentially harmful content. The PDF's structure and the presence of multiple disposable hosting links further support its role as a distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=kamen+rider+psp PDF link annotation
    • https://contact-house.com/fckeditor/upload/file/31045853328.pdfIn PDF document text
    • https://doitoutdoorz.com/file/XU9P3s2kaE3B36r2.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/70784841283.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/41822046748.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/12243875222.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/37057064171.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/piliwaruxukojudal.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/41415033716.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1613139a537d03---64525709035.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/16143808625.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109161754409834.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9c50f28e2---95287050171.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/3316288083.pdfIn PDF document text
    • https://bliznacite.com/files/84289455627.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/29731359002.pdfIn PDF document text
    • https://network-italia.it/file/57314254122.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/nifitasuwijobubeveranixon.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/90657937304.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/tisimexoboxezepiririrupi.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210911075259529.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/sipefavitori.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/kebulep.pdfIn PDF document text
    • 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_off0000f5a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A0 21680 bytes
SHA-256: 9aa9c99c1f0a3c024501f40268a385be9a545e065d5cf9865cf04837f6e36057
font_01_sfnt_off00012ed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED3 10280 bytes
SHA-256: 553b0a4701434124b8bcc4c3b3c7312c348351228811c5960c06a7293b4d224f
font_02_sfnt_off000145d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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