Malicious PDF — malware analysis report

Static analysis result for SHA-256 b31f231c672b46ab…

MALICIOUS

PDF

81.9 KB Created: 2021-09-22 18:45:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1ec3fe8a980c1bb2e8735aaf5db1ffb8 SHA-1: dd76775ad073f600cb045fc3960cfe1c64f21486 SHA-256: b31f231c672b46ab46b992f346d002c022dd5b4d57fac0fd2791e8a16b73a12a
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to PDF files hosted on potentially disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://bahia-group.com/ckfinder/userfiles/files/fonofasemo.pdf In PDF document text
    • http://csc-0411.com/userfiles/file/20210905190512_k7o784.pdfIn PDF document text
    • https://probidjp.com/ckfinder/userfiles/files/20210915_202326.pdfIn PDF document text
    • https://gencatakan.com/upload/file/65682704171.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/pobisilizupor.pdfIn PDF document text
    • http://www.motocams.cz/ckfinder/userfiles/files/suwisem.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/41021886699.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/fexajulinebu.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/85c45ecbc81240d35c65278afae9c535/32144134678.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/40322309936.pdfIn PDF document text
    • https://find-domain.lazy-online-shop.com/app/webroot/userfiles/files/gujamomazixonanivur.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/gefivozusegiwotixifip.pdfIn PDF document text
    • https://tgvl.in/uploads/fck/files/busiwanasetolumezola.pdfIn PDF document text
    • http://unsersohn.ch/images/file/gisiwujajuratevomu.pdfIn PDF document text
    • http://lafiestadelmoto.cz/files/file/sivazimitatawakoniga.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/tasaxuto.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/lonom.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/68140759733.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/gisawarewif.pdfIn PDF document text
    • https://4wheelchile.cl/admin/uploads/file/989821846.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/japedixug.pdfIn PDF document text
    • https://derfo.info/resimler/files/zevum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=clash+royale+mod+happymodPDF 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_off0000dbbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D0 17716 bytes
SHA-256: ec0457036db7815eb471e7b8b860f98b6eece3d289b7ff32045ddc0679fc0bce
font_02_sfnt_off00012213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12213 10508 bytes
SHA-256: 79008badf3f43140c09dc184f268d3e99d9f633b9b5ced2d05df95e01d182509

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