Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a12b1ebb6d5c7f3…

MALICIOUS

PDF

73.2 KB Created: 2021-09-27 15:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f8672d14762366940aa66d0098c85e7f SHA-1: 15fda8728349c40f628cd9b3e4c668abf9bb8959 SHA-256: 0a12b1ebb6d5c7f3c4f9d159f8baeef9114a0b348485f134dabcef95f6467da9
126 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating suspicious PDF content. The document contains a large number of embedded URLs pointing to various domains, suggesting a link farm or phishing attempt. The presence of 'utm_term' in some URLs further supports the idea of tracking user interactions with malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://oniceh.ru/uplcv?utm_term=mrna+codon+for+valine PDF link annotation
    • https://aventura-agence.lu/userfiles/files/72051184117.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/kitib.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b16e65fd6b---wunuki.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/72339433618.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/rinawerukozivawi.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/nogewogofisi.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/kotejokaliso.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/pederewosojirufewapozew.pdfIn PDF document text
    • http://yuli-china.ru/d/files/98561995467.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/pukifetikopimava.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/jusexaninevowobe.pdfIn PDF document text
    • http://smogy.ru/files/files/50140869751.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/besitosimubi.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/sefapuw.pdfIn PDF document text
    • http://chipgene.com/image/files/20210905_195127.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/48814006675.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/xiginaxukomuvamipezuk.pdfIn PDF document text
    • https://e-midas.ro/files/file/48570973393.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/87425056746.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/muzapeg.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/tepufegepibafabetov.pdfIn PDF document text
    • http://unseretochter.com/images/file/14727800345.pdfIn PDF document text
    • https://ebus.myskoolapp.com/FCKeditor/FCKimgUpload/file/rulonexogidezunowosas.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_off0000b434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB434 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4B 10264 bytes
SHA-256: b7ed91bf84f0185d5f7315e8f04714c2207964843fe4ebcd3a5f11f344b1ceb8
font_02_sfnt_off0000e376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE376 20004 bytes
SHA-256: 6fae3ff99b4baf29c526f12dd6397f8fd5ca79e3a48c98e0c2c7e17729b39f50

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