Malicious PDF — malware analysis report

Static analysis result for SHA-256 c27d9a7f19b268d9…

MALICIOUS

PDF

80.8 KB Created: 2021-09-19 23:09:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b69b5d48070678ea56b651b95c9cea60 SHA-1: a3ac7e12a91a0fb4dfe168f069c4ec50e0e9f682 SHA-256: c27d9a7f19b268d97bb57c8d6b568f7aae718678245b3d6cd50619fdae135ebe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism to host malicious content. The presence of PDF-specific heuristics like PDF_SEO_DISPOSABLE_LINK_FARM indicates a deliberate attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • 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.
  • 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://upaspor.com/resimler/files/surivifax.pdf In PDF document text
    • https://studyhalltracker.com/files/file/siroxutipibilenen.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210904_095911.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/suxebuzujulubinevij.pdfIn PDF document text
    • http://wdnederland.nl/file/jafosovinigivozejudoseg.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/pupizobamupogakegazejeb.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/nekojabepegejepetefesakes.pdfIn PDF document text
    • https://eurosan.pl/user_images/file/68619479836.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/guvemaxirovitumiwogudilix.pdfIn PDF document text
    • https://stichtingech.org/ckfinder/userfiles/files/38259085675.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139de4d18194---61782219277.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/wopesuwuno.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/554000755.pdfIn PDF document text
    • http://santabruna.cl/upload/file/93267409484.pdfIn PDF document text
    • https://windsbs.biz/files/file/lutamuzonovujilowomagifa.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/13310202041.pdfIn PDF document text
    • https://demideopool.ro/ckfinder/userfiles/files/14106018222.pdfIn PDF document text
    • http://irths.com/upload_files/files/gadusifixifigulofowusig.pdfIn PDF document text
    • http://umartravel.com/files/kifufevedodozekevexukole.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1613c60c59d36e---30435686685.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/pofoporonugagejonuta.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136d2aca5eb0---81073246234.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210906024419.pdfIn PDF document text
    • http://huemin.com/fckeditor/userfiles/file/tosiwerofud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=pokemon+tournament+apkPDF 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_off0000d834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD834 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04B 10300 bytes
SHA-256: 772aba1e127638eec5c0ab2cb4784874202adb61555b469ebe49f15645e8c924
font_02_sfnt_off0001077d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077D 17764 bytes
SHA-256: aadaa77b2fae8af428483031ad5621a9f42780e7b6b60ce8685960de7cb5e2fc