Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae9ee8f11e69084d…

MALICIOUS

PDF

80.0 KB Created: 2021-09-15 09:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d2d8c71b1755f858db5011add36c8cf8 SHA-1: a7b722a8910406d7d08821adefd85d958cc0e880 SHA-256: ae9ee8f11e69084de843e8f857dddf890a64358d42be754d4faa0c72bfd932e3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to PDF files on potentially disposable domains, suggesting a link farm or phishing lure. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags this behavior. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://sibstroiexp.ru/userfiles/file/44467694614.pdf In PDF document text
    • https://petribax.nl/userfiles/file/68502049177.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/jofigu.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/65373453978.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/zugowaxawupujow.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/momub.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210903103209_1lx2zx.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/mutuwubaguguzaf.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/161413807308c3---24070106266.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/nawimuwulufuzo.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/19464546695.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/58731314265.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/duguf.pdfIn PDF document text
    • http://portableandcool.com/files/files/dufolari.pdfIn PDF document text
    • http://curvesncontours.com/userfiles/file/559362786.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210901223224.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/88020193190.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc466c0df2---lulidinanek.pdfIn PDF document text
    • https://norservis.com/files/files/mawezogogovatojunivu.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/nepisetosu.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/romer.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/72014203687.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=acceptance+letter+for+tender+awardPDF 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_off0000d57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57C 10420 bytes
SHA-256: 7fd651a65ddec0e0fa399e91a6379fd4c227cc2c1eaeda43678a43a24533b0d1
font_01_sfnt_off0000ed4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4C 17312 bytes
SHA-256: e318d839b3ea1fd6468c2db4d3020d7be847aa323d5e710143100988a83955d9
font_02_sfnt_off00011a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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