Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ceb4ce7d316fd31…

MALICIOUS

PDF

79.5 KB Created: 2021-09-15 17:33:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d325271cdbd41b7b8eb879bd2f20fd51 SHA-1: 91e878d9c805c178ae631f40dd8103a62649868d SHA-256: 5ceb4ce7d316fd312a93c966efde2976e6172d797d84c4242e0969bcb61dac60
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links to external sites, with one heuristic specifically identifying it as a link farm on disposable hosting. This suggests the PDF's primary purpose is to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://vjlabor.pitscovn.com/uploads/Upload/files/59785821035.pdf In PDF document text
    • http://thuocnam.xyz/images/files/83712688584.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/wosonefikubixovokipom.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210910030704.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d80424995f---vifojutimukitepurapulerez.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/69394977964.pdfIn PDF document text
    • http://spbi.cz/res/file/9260739842.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/jakotumuwafexazuxexojer.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/56696068374.pdfIn PDF document text
    • http://apvn.info/userfiles/file/12966166758.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87572027309.pdfIn PDF document text
    • https://33mobility.net/uploads/files/toguzavegewomalupude.pdfIn PDF document text
    • http://www.motocams.cz/ckfinder/userfiles/files/zujusoti.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/17756636246.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/9915314296.pdfIn PDF document text
    • http://intertermo.nl/userfiles/file/67388483595.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=mp3+cutting+appsPDF 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_off0000d0c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C2 10416 bytes
SHA-256: 8fdbc4606ebc3f1cd4c48635b505c93369e9b12c2f254ba12c87c954a53ec4dc
font_01_sfnt_off0000e884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE884 18728 bytes
SHA-256: 19b734385844efd733be533ad1d5289e4ece08c0f5970974747b8577db0ae963
font_02_sfnt_off00011891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11891 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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