Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb7c512f2cdbc690…

MALICIOUS

PDF

70.5 KB Created: 2021-09-12 06:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5687ddfeb6435134898c0ef876f95b80 SHA-1: 2d46f6732af31d4a99b3d56e842aa36df8d868bd SHA-256: cb7c512f2cdbc690a17a590332c332a0c72b8ecb6674abb23e7c326923745ba8
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external resources, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the PDF_RANDOM_URL_LINK heuristic further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://orkoien.com/userfiles/files/25083410919.pdf In PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/refopowubu.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210905223413.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/64324458496.pdfIn PDF document text
    • http://demo-enriquemora.shopcloud.es/ckfinder/userfiles/files/94068670324.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/78744680733.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/96546627550.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/59166330880.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/gevetojuz.pdfIn PDF document text
    • http://quangcaovuanh.com/vietkiendo/upload/file/zajog.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/mefifupefajisoxixuson.pdfIn PDF document text
    • http://bptramptour.pl/files/file/midasimof.pdfIn PDF document text
    • http://saimiri.name/upload/file/27513023935.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/25831500163.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16136140424542---tarowoxudoruji.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/xapekikexegoradudiseka.pdfIn PDF document text
    • http://lunaleo.pl/userfiles/file/fimoxa.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/4213313874.pdfIn PDF document text
    • http://df-foundry.net/d/files/58520777695.pdfIn PDF document text
    • http://honghuibio.com/d/files/bawizolabuxumiduf.pdfIn PDF document text
    • http://eksternest.be/images/file/40712348247.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=watch+premier+league+years+online+freePDF 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_off0000b0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D7 11136 bytes
SHA-256: e8bbf1121c40e46008fea964855e9456758c88df7e8967e55d35664706fe23f4
font_02_sfnt_off0000e2b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B2 16176 bytes
SHA-256: 68fb86f9eed2d0cf10fc18f948afa8f369b6ba3c6defe2ad7d2986737265287b

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