Malicious PDF — malware analysis report

Static analysis result for SHA-256 40aa12451e1a2070…

MALICIOUS

PDF

73.9 KB Created: 2021-09-19 05:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cdd58759c6fb4ff2ab0470b519d84e20 SHA-1: ccb5fef24970a81729f0800e2db7b8bc7c4c978b SHA-256: 40aa12451e1a20707e62455e3db4e6ece997722cb6ebb10b72d5b9e0653549f5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to domains that appear to be part of a link farm, suggesting a phishing or credential harvesting attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high volume of links spread across many domains, a common tactic for evading detection and distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wojifewanijuw.pdf In PDF document text
    • http://instalace-charvat.cz/userfiles/file/9464559143.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/zanelatux.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140363f9eac5---67064550109.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090205352840.pdfIn PDF document text
    • http://msiutilities.biz/documents/15702040298.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/rupepugonerudemupugiz.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/tikarikenu.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/14858057543.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/368c10b5d71ad3e5a69257054a1e1548/98069856212.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/tukixesawik.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/nutapukiramegoraj.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/nuwiruga.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-10/2109101254200263815krjw6eor5mw.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/97731223446.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/55433271689.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/90433870618.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/68329212773.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=an+idiot+abroad+putlockerPDF 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_off0000bdde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDDE 10652 bytes
SHA-256: 52a96d4c6a5b697e3e58eb9d96a12d9742757e41083beda1e7eda212f24f6c6d
font_01_sfnt_off0000d623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD623 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE35 17164 bytes
SHA-256: 4f2aa13753e2244b9f67281d2a92c323fb3bd7f89b7367233ab3e512b983b0ad

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