Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3216a7020c6c226…

MALICIOUS

PDF

84.8 KB Created: 2021-09-12 14:54:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ce9ff1ee497323e75ebb051a65fc6719 SHA-1: 510069d04690596be9cc50c3e26d0c6ec653d1aa SHA-256: a3216a7020c6c2265a83be012c0340e74224be30e488d5f73b34604270605495
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable or unknown domains, suggesting a link farm or redirection mechanism. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a high likelihood of malicious intent related to link farms and potentially SEO manipulation for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://canevastoilestjean.com/upload/editor/file/885859149.pdf In PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/fovurifidimunidomeguned.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/wawapo.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/mosivatapozebenaroduvo.pdfIn PDF document text
    • http://naturpix.ch/cmsimages/file/82531503510.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/mukitos.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/palunajifavobelalam.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/n9vc20rnartobaq4odmvaj05sk/raxirejubinewerige.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/gusugumibagasisebin.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/bofegibexexi.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/86269497712.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/ginufo.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210904035100.pdfIn PDF document text
    • http://gfk-schwimmbad.de/i/File/totun.pdfIn PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/fotapudixur.pdfIn PDF document text
    • https://ever-progress.com/upload/files/33437765826.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/84596888493.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa31a0212e---76702014105.pdfIn PDF document text
    • https://morabia.fi/images/file/tetimuxodenovafotorokixa.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210908_025800.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/menosokadununo.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/73160046639.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=recuperer+photo+android+apres+reinitialisationPDF 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_off0000e3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC09 18640 bytes
SHA-256: f8f0c28d7cfa9993c6546b295a3d8918e7b01c3cfa7f8fb91507f6c0c0c3637f
font_02_sfnt_off00012d24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D24 10756 bytes
SHA-256: 12d3aa002b782fc6b08921b39f9e8396f327c1a678dee796a997a7a825630d3a

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