Malicious PDF — malware analysis report

Static analysis result for SHA-256 128ce1d363e11c3c…

MALICIOUS

PDF

79.8 KB Created: 2021-09-17 20:16:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5e7645b20463df87248641408a060376 SHA-1: 260ea0a29c37df3f3295beffacb77e7348fbac7d SHA-256: 128ce1d363e11c3c1bb762b151af17206be824c386ef89d97b00e841eb1d6c1a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifies this pattern. While no scripts were extracted, the overall structure and URL distribution strongly suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613187b4237e0---fimojafaxazosuteno.pdf In PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/kezibifoxodimu.pdfIn PDF document text
    • http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/7912865097.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/xuzofotofazafutifew.pdfIn PDF document text
    • https://comfort8889.com/upload/files/5277500319.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/40676939355.pdfIn PDF document text
    • http://jiji.pgo.tw/pic/uploads/files/89151972836.pdfIn PDF document text
    • http://elskenecologie.nl/files/juwaxuja.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e99771b6f---pumugijaneba.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/neperegemedogeravodeki.pdfIn PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/positojemileleri.pdfIn PDF document text
    • https://akvaguru.hu/user/file/dixemowizaxolivo.pdfIn PDF document text
    • http://hidropro.hu/upload/gudikabolixuvo.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/85377691262.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/guneguxukakasopexalomos.pdfIn PDF document text
    • http://stl-hk.net/userfiles/powonirodapu.pdfIn PDF document text
    • https://ancoraeducacion.com/images/nugejetotojive.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/bupunivazisibonuxera.pdfIn PDF document text
    • http://phanvienphianam.com/uploads/userfiles/file/mesiduwudatugajenag.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rosabiropejorijan.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/43726583959.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/godesasunofutubijus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=best+apps+for+s+pen+note+10PDF 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_off0000d3a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBB 17672 bytes
SHA-256: 5b6afb095ac1761e0eb809906c37da99fbeb08664924cac71b31c7b8054360a5
font_02_sfnt_off000119d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D4 10440 bytes
SHA-256: 2c83a57b77bdcb45e3859fd28ce091a4f300892f19bc8ca1bf3544dc373b361d

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