Malicious PDF — malware analysis report

Static analysis result for SHA-256 612d8a3a7f55a7c9…

MALICIOUS

PDF

70.1 KB Created: 2021-10-01 02:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 6c0d4aaaa5a603c20a09187eca571589 SHA-1: 3b2998d354dfc6f1e5c968290e105554be962716 SHA-256: 612d8a3a7f55a7c978ed93511b81c634025ad3026a49d92ec378c8df14b026f8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ketchas.ru/uplcv?utm_term=radians+to+degrees+and+degrees+to+radians PDF link annotation
    • http://abwrosedale.com/uploads/files/83439819345.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/kisofekor.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/19519921073.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/93652643809.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/zagilunasam.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161486a015240b---wabizirimegivanorutokituf.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/48278321419.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/zibilesexapogonafuzufinis.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/11763852520.pdfIn PDF document text
    • http://www.pvvc.cz/files/sukaz.pdfIn PDF document text
    • http://gibisch.org/files/files/2202657047.pdfIn PDF document text
    • http://anninh247.info/upload/files/bopobeviz.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52032035556.pdfIn PDF document text
    • http://zlhk.ru/upload_picture/file/xozoximajetifo.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/pibozobodubidunobuvomukaf.pdfIn PDF document text
    • https://viettrungson.com/media/Files/88656420862.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/wegadarudarilugef.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/savuvunom.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/42474620405.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/35795318407.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/1af560afbdcd52722c238339e564eecb/61440917125.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/wajipolu.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202109090606432854.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_off0000b014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB014 16868 bytes
SHA-256: 5cff190058838a9fe495d3098abfda3699c0d6a1763235bf018a1a5a1b8d83e9
font_01_sfnt_off0000db02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF319 10420 bytes
SHA-256: 28e95ff376ec270d10f2be251bb629589f08470d129aab1a76cb7757147348af

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