Malicious PDF — malware analysis report

Static analysis result for SHA-256 8090d0d11f5c1729…

MALICIOUS

PDF

82.0 KB Created: 2021-09-23 03:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 55e8cc97641e995c1579a04fb3fa2ed3 SHA-1: 25c341ad03a2fb8c4866ab922b329dd2cc377b2d SHA-256: 8090d0d11f5c17296680d480c610d4ebce2593bf1b48d4f3f2a79fbe8cb591ea
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Numerous embedded URLs, including one with a 'utm_term' parameter suggesting tracking, point to a link farm hosted on disposable domains. This indicates an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://inwebjor.ru/uplcv?utm_term=master+html+and+css+along+with+100+projects+pdf PDF link annotation
    • https://rhuyscampingcar.fr/images/files/rulovibivoxaluvisifo.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/20011087707.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/96796163674.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/jojusojoxuvujazulogisid.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/57142533769.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/luravom.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/20476156266.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/ginorugogurajifi.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138f9a3e149e---87469735372.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/fasogivomifulafiridotiw.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/60365448653.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/dezasejirireti.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/fivolob.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/19387406574.pdfIn PDF document text
    • http://unsersohn.com/images/file/gixum.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/3732ac2e2f22bd93c3316c046078b55a/lowexuripowipijanibe.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/sebejojekumiliwutige.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/gagemokiwaboxinod.pdfIn PDF document text
    • https://soechi.com/userfiles/file/33873565498.pdfIn PDF document text
    • http://neapol-m.ru/usr/file/dubobo.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/gavigemimo.pdfIn PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/34813161396.pdfIn PDF document text
    • https://auto826.com/uploads/files/tilub.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_off0000d781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD781 11448 bytes
SHA-256: 3fe4484c5900161bf0ea69ce7174871925b3ab7a4d54c36ca9360711a37f65bc
font_01_sfnt_off0000f232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF232 18292 bytes
SHA-256: 91830ab48c1749386ec06db6b7235824ce241f3353b96e0bc67030b34984f3df
font_02_sfnt_off000121ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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