Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8754a7342aa8c72…

MALICIOUS

PDF

70.3 KB Created: 2021-09-25 20:31:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4e5ac82d1303fae1acb5ff60e81d6af3 SHA-1: f8a3b52ccea3b8e0cc3284b72e2b9067769f6efb SHA-256: c8754a7342aa8c72489e4ac710e8b5e1a1968e0fee341549c5cb25a1829ef04f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many pointing to PDF files on various domains, suggesting a link farm or content distribution network. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates a malicious intent related to SEO manipulation or hosting further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://universitecentrale.net/uploads/FCK_files/file/jinasexomup.pdf
    • http://ipcmanpower.com/admin/style/images/userfiles/file/1079501676.pdf
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/44805509985.pdf
    • http://noithattamphuong.com/upload/files/giloli.pdf
    • http://demo-enriquemora.shopcloud.es/ckfinder/userfiles/files/tizegidekalajinolosaz.pdf
    • http://rracc.com/file_media/file_image/file/44868944439.pdf
    • http://bielwod.com/userfiles/file/bokoloxokurofomapib.pdf
    • https://bushregenerators.info/userfiles/files/wulijenof.pdf
    • http://aggengr.com/uploads/CMS/file/68528830930.pdf
    • http://kalkulacka-hypo.cz/userfiles/files/fixajufa.pdf
    • http://www.horakgolf.cz/ckfinder/userfiles/files/9127161206.pdf
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/resupajavirafepo.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/28c7bf245b64fc41f5f286ebbf92bf97/15181338577.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/7dc39d6f5979085f5faa86a728c35523/pinuzolafijasu.pdf
    • http://mevlanaasm.com/resimler/files/10419588106.pdf
    • http://dui-antidote.com/images/userfiles/file/wonatuzatunij.pdf
    • http://becucci.it/userfiles/files/60289774799.pdf
    • https://simon-daulte.com/ckfinder/userfiles/files/22279610357.pdf
    • https://www.jakketoes.be/ckfinder/userfiles/files/batuwedujudi.pdf
    • http://om-ar.com/userfiles/file/260507911.pdf
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/45229251739.pdf
    • https://perfecthospital.org/FCKeditor/file/49524966314.pdf
    • http://zwickerfoto.hu/_user/file/43016922225.pdf
    • http://ajtoablakcentrum.com/_user/file/70012152122.pdf
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/xajutozofaze.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+bypass+iphone+lock+screen+using+emergency+call
    • 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_off0000afa4.bin
25c4425a25d45da5c9f8e49829e0004f26577fef169e341253b79cfa4bb96eed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFA4 11344 bytes
font_01_sfnt_off0000ca04.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA04 16792 bytes
font_02_sfnt_off0000e216.bin
eca0dcb5f8f1f1313ad8c595f8bab4227aed9747f311f86a9106f948f9f6cd5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE216 15532 bytes

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