Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d88bfd3bdbaa92a…

MALICIOUS

PDF

72.7 KB Created: 2021-09-10 22:34:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e6a15376c48aa6c57bb3537f8c4381e2 SHA-1: 97e73f4ab10f5b9580b2096614d8cc9921ca0411 SHA-256: 5d88bfd3bdbaa92a2df2d71b64a132e046ae9c76dd29ea618f52b0c2e6dbd930
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links and a heuristic firing for a 'download button' lure, indicating a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' and an ML classifier score of 0.995 further support its malicious nature. The file likely serves as a lure to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://pixomot.ru/uplcv?utm_term=pokemon+ash+gray+file+download PDF link annotation
    • http://haithuanphat.com/uploads/files/fivexitagamizepebaxuki.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/77723461389.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/18821054024.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/fdebd7f2f25ff173d64ef64c6a0e2a6a/85506672813.pdfIn PDF document text
    • http://shriramashramps.org/userfiles/file/gufanomefonexepodegu.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/jokotev.pdfIn PDF document text
    • http://nagyberki.hu/sites/default/files/fck_uploads/file/4407683166.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021090501344973499.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/bibina.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/86444721900.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/pijovol.pdfIn PDF document text
    • http://hantechwelding.com/userfiles/file/2021090512364873499.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/savalil.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/zifugasoxo.pdfIn PDF document text
    • http://gro-felix.si/uploads/rakizurisijixu.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/didimilusarazazos.pdfIn PDF document text
    • https://yasacompany.com/upload/files/gedujafejo.pdfIn PDF document text
    • https://ilonew.tasksplan.com/userfiles/files/15285116612.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/nifoj.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/fiwaximof.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613432622dfe6---20054100283.pdfIn PDF document text
    • http://hitmet.slektenkaas.com/bilder/file/57460927005.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/livorim.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_off0000b8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CC 10996 bytes
SHA-256: 2c28ed52a5b77a0f707f409624364e147d582739a5b8fc92c16d8500922d474c
font_02_sfnt_off0000e9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FA 16748 bytes
SHA-256: f9f3983113167205b1f0a5ff234e60185d97230a82a530f729ae2c03ae67fcf1

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