Malicious PDF — malware analysis report

Static analysis result for SHA-256 04b9d1d13eebc272…

MALICIOUS

PDF

82.6 KB Created: 2021-10-07 18:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0809a0febdfca2594db8cedca44c4861 SHA-1: dc3e43828bcac2485c84cefff0dda17e07f58426 SHA-256: 04b9d1d13eebc2723d0f16d499ba16126d057eb59414977a81feff96cd42ccb0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous external domains, many of which host PDF files. While no scripts were directly extracted, the PDF structure and the nature of the URLs suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://airin.lv/images/userfiles/file/86988002834.pdf In PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/28436911627.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/77604287963.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/sezufos.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/94554564489.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/nenefogiguw.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/19863090967.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/30553357675.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/jobajiped.pdfIn PDF document text
    • http://genbreedpublisher.com/files/upfiles/file/dolumiruwelagijubutorub.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/gugiwikirerovupixoxig.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/61327619276.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/ca9c7d64479dea4a16f9b14ce427f4f2/seniburaxekobomufopej.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/vonolofufizako.pdfIn PDF document text
    • https://loonbedrijfschimmel.nl/userfiles/files/59985476065.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/feridiwixebuxokatoxudula.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/81807826157.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/58658541042.pdfIn PDF document text
    • https://mentormedya.com/files/ninowaninelona.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/labekitelepajorilixobenir.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/rusilaxumewomujeto.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/lozutonugebesokumutepeb.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/suzafuzenadas.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/werajomibumoden.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/48191526331.pdfIn PDF document text
    • http://sodrex.pl/userfiles/file/savalogojikozapikav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=internal+environment+of+the+human+bodyPDF 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_off0000dc9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9D 10820 bytes
SHA-256: 9a3d8963f51aad9e85ec9295346aafe25881b55d68cb46ac82213a2a461527c2
font_01_sfnt_off0000f557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF557 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D69 18340 bytes
SHA-256: 2b6e679068de1db1dce866e1ae23108c3d1d42cc12b5987a118a8b58a5971730