Malicious PDF — malware analysis report

Static analysis result for SHA-256 f89becf90c7d0c65…

MALICIOUS

PDF

80.1 KB Created: 2021-09-20 02:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bbc04079d967608dc69a6e1a2686ed00 SHA-1: 83bedb23a307e57ee9d1b21bc96f6d69c8d2b3ed SHA-256: f89becf90c7d0c65f5edeeaab5000293f59ce76fbfc3e24d77876796e61f06ed
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful content. No scripts were extracted, but the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://coretry.ru/uplcv?utm_term=use+the+following+words+with+digraphs+sh+in+sentences PDF link annotation
    • http://heatexchangersolution.com/upload_fck/file/2021-9-19/20210919223645495031.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/38071700672.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/jotivotipukaxo.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/19110314447.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/zodexepurike.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/6237506430.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/96087060643.pdfIn PDF document text
    • https://matagujrischool.com/admin/imagetemp1/file/dukofazanewefobubetika.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210911_61638D3CB8645AA9.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16135eeefe1dd4---51237155256.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/kunosebufatadulexop.pdfIn PDF document text
    • https://tl-systems.hu/files/files/26809465187.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/lozerepazijewumezom.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/dudifudapekux.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/4b6bb8f9657801e6f2d5fcc843884295/kimamajikuxigadimuwufer.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/86532434616.pdfIn PDF document text
    • https://jamurgoreng.net/contents/files/50206139314.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/wufagazafumogexiravas.pdfIn PDF document text
    • http://bifruit.mk/ckfinder/userfiles/files/zebodusutu.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/49922377272.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/sajofux.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/87746910627.pdfIn PDF document text
    • http://hkwwta.org/userfiles/wekemapepaparapoxijexak.pdfIn PDF document text
    • http://sakem.org/userfiles/files/67177570216.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_off0000d3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CE 17688 bytes
SHA-256: 10743a69e93bbc91399578ff8921ba2b3bbba70b181ed0eaaa0ee5ae2b80f904
font_01_sfnt_off00010101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10101 10992 bytes
SHA-256: ce6334596702540ba5f5979ef1a922ba4c776854feb28a765ba1db4669884c40
font_02_sfnt_off00011a5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1