Malicious PDF — malware analysis report

Static analysis result for SHA-256 7204ba0cfb317d6c…

MALICIOUS

PDF

72.9 KB Created: 2021-09-15 11:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1bb0eba6ae7219d046c91967e8c423ec SHA-1: 0dd8dc6042e8f0b900ac3af8f44f950f2bf2f98f SHA-256: 7204ba0cfb317d6c6be347829202011b197595249342d0ad7946685e632d0db1
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to a link farm designed to distribute PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of SEO poisoning or malware distribution. While no scripts were explicitly extracted, the nature of the embedded URLs suggests a potential for further malicious activity, such as downloading second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://dtjxbpzx.com/filespath/files/20210912031247.pdf
    • http://avvocato-callegaro.it/public/file/lotevezekivebememalet.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613261ef2ad7a---33425723318.pdf
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/pipezetizanila.pdf
    • https://gastriklandsbf.se/UserFiles/files/powopadoreg.pdf
    • https://ud-hobby.com/images/Upload/file/98246582632.pdf
    • http://newbusan.net/FileData/ckfinder/files/20210904_3BD31B600A576C17.pdf
    • https://tw-itemaos.com/ckfinder/userfiles/files/86983825747.pdf
    • http://pspectr.ru/userfiles/file/rifoberiferam.pdf
    • https://myclubowners.travelenvogue.com/userfiles/files/32825000713.pdf
    • http://chono.mn/uploads/userfiles/files/rodaterolopaga.pdf
    • http://kiko168.com/UploadFile/file/20210905062744773.pdf
    • http://twtime.com/uploads/files/202109012334359410.pdf
    • http://essentielles-theater.de/UserFiles/File/32030629623.pdf
    • https://dpt-mh.com/uploads/news/files/pajuvulinuk.pdf
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/84006486669.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361acee5065---dusitewewukugawa.pdf
    • http://dastone.ru/userfiles/file/rezorupexaxuruvow.pdf
    • http://viviapalermo.com/userfiles/files/33044704658.pdf
    • http://www.workbythai.com/admin/assets/images/xelujilewosazodidaf.pdf
    • http://zgic.ru/!upload/files/lenexomubipokuwanawo.pdf
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210905160322.pdf
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/weminotuvubaxexakepibunod.pdf
    • http://bezpiecznamlodosc.org/files/file/6605354063.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=live+football+tv+streaming+hd+apk+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9ac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB9AC 16792 bytes
font_01_sfnt_off0000d1be.bin
72bb90ed4844c3ce22b78e7f4374defb9c1f985facd3cbf5b2feb2b102a2c8ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BE 16484 bytes
font_02_sfnt_off0000fc24.bin
f557f72b69246a49adfecd5e10af95409814068109e0504ca9d6408e90f26b18		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC24 11288 bytes

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