Malicious PDF — malware analysis report

Static analysis result for SHA-256 27174992ef2801a5…

MALICIOUS

PDF

76.3 KB Created: 2021-09-15 13:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bb1c3cc28d646815d435e7fc6443a96d SHA-1: 8c63cbcbabc58c0ecac9d9862a9c34da39c6c773 SHA-256: 27174992ef2801a548dcf78acba4eafb7f8e2b9426d1949e114cdb5de93c8b04
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, indicated by the presence of a link farm with multiple disposable hosts and a high ML classifier score. The ClamAV detection further confirms its malicious nature. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://biplano.eu/userfiles/files/39207530817.pdf In PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/nelorokopam.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/tidifatanitede.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0a9679895---67821979562.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/11484348347.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/nibosuwud.pdfIn PDF document text
    • https://telenovella-bg.com/files/59917687596.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/73220450941.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/repogatukilupalapowe.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/9357086066.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/donimoroxoner.pdfIn PDF document text
    • https://bagstyle.uz/images/file/92677247196.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/vuzibisaxanuwusaxod.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/tedaxareliku.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/47758279174.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/65322601845.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/g7in14amurn14q25l0g3efodcj/5367122248.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=face+chat+lite+mod+apk+unlimited+coinsPDF 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_off0000c578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC578 10848 bytes
SHA-256: 4b39736e9e7cdb655977dd90ac957588d0c520522dd45ca7ccd40fc926c47310
font_01_sfnt_off0000de4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF661 17684 bytes
SHA-256: 5076bd57bcacd02011749895ab21357835f26effe44a72a95553f24c3d597e98

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