Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8c778ac2dcc3f75…

MALICIOUS

PDF

81.1 KB Created: 2021-09-24 07:18:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a9b4533eed53a501b4342f3b24c1662a SHA-1: 262b3b65e7fc3d1c08cf79da48be40ff75a83db7 SHA-256: d8c778ac2dcc3f75ec92f38358a910c45778806b22999defe35abf92bb377b84
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics identify it as a link farm with numerous distinct hosts, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://miroslaws.com/ckfinder/userfiles/files/75317392065.pdf In PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613dedbc852c9---buwejimajujuromuzifi.pdfIn PDF document text
    • https://ibextrail.com/editor-images/69070599037.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/zalulekutomulufazuviwi.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/6359664638.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/womuka.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/72329415409.pdfIn PDF document text
    • http://rotang.net/userfiles/file/lawerusutitibal.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/41671680545.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/xitafegafukug.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/vupuzajesexoviruzew.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/19026307524.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/penudoveve.pdfIn PDF document text
    • https://stichtingech.org/ckfinder/userfiles/files/riguxosufase.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/53982791433.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/76297206725.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210908110645.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/pukezufojebeworabigibovok.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ce963eb04d---46258827312.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/84796145025.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/8654102620.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/wogivuviwijosiz.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/xatuvogeluvanilej.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/25407642179.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=mass+st+francis+xavierPDF 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_off0000d7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC6 10324 bytes
SHA-256: 1762ee5eb2ae742f1639a9e9f3f1943bb97f4eee88f0854c3e457f81c3b39087
font_02_sfnt_off00010740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10740 18356 bytes
SHA-256: 6ce3e80e135800b0ffb167366a81faacd01f4904dbaa97ab1aee14d4f51dc86e