Malicious PDF — malware analysis report

Static analysis result for SHA-256 01351c4074b5c96c…

MALICIOUS

PDF

99.2 KB Created: 2021-10-10 20:31:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a9cc5e8b69d348cdb020f0ff559812ff SHA-1: 4743f40e31aff02e442330d7ccd12425e4c48a4c SHA-256: 01351c4074b5c96c5cb0c5f7dd4321f3aefc615627efeff1b32f49b8ba5e0380
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs and SEO-related heuristics indicates a non-standard document purpose. No scripts were extracted, but the overall structure and heuristic firings point to a malicious document designed to mislead users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 4

  • 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://liho.cz/UserFiles/File/64300816633.pdf In PDF document text
    • http://nagyberki.hu/sites/default/files/fck_uploads/file/52431482527.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/rafuzobexi.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/sekenigebitoxig.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/65366708368.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/danafujowolijefetogubimal.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/suxevavaw.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/10218117630.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/xidis.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/xulazowoledubeten.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/lefagozami.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/84043337407.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1c8abfef4744724e43abf719cb74993a/87976363558.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/futitujepupudose.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/93297466794.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/99418281566.pdfIn PDF document text
    • http://razvoj.e-podjetnik.com/ckfinder/userfiles/files/ragokazidamutakus.pdfIn PDF document text
    • https://stichtingech.org/ckfinder/userfiles/files/27661658020.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/xesufaluv.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/xovegojolawuzuwelobe.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/7058429576.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/komuguleturolinudad.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/23653641758.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/74671617155.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=army+dining+in+scriptPDF 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_off00011bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBD 10492 bytes
SHA-256: 8ebaf14d089ebb6c2e3a94099ad3b2449c65824d07c315fc717a65b73f22a928
font_01_sfnt_off00013358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13358 20104 bytes
SHA-256: ca163128cb4400424b53fb0c4dd621d3f301989b4a8e0874b42001359ed2e967
font_02_sfnt_off000167b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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