Malicious PDF — malware analysis report

Static analysis result for SHA-256 23d47e4b96b20396…

MALICIOUS

PDF

81.7 KB Created: 2021-10-05 09:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b844c07f7f6125d1ace9330e75d38da9 SHA-1: c5a42b02e423b188fd5db8251e64b4effd37a60a SHA-256: 23d47e4b96b20396b99a07a70b17ff1846c3699c90e580dd3e3f8eb4bece330f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to disposable or unknown domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://listocrm.com/userfiles/files/97865912791.pdf In PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/pqgq0ahfg8odne5nlnpkgiab42/gegitixazovif.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/31055748246.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/bekobalerajugikalulolepeg.pdfIn PDF document text
    • https://apapunada.com/contents/files/85382275931.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/76978448070.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/74398135595.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jirudewo.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/zimizolufikaxiketowujofu.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/17711711777.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/legetobosolo.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/dararadipenirezo.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/23852280254.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/suzixikifefelubefaxiv.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/dufanupafevoxisurikotu.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/pewakowo.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210918_CA27ADA8EC9C4016.pdfIn PDF document text
    • https://luminex.pl/upload/file/kakalexubesinorajen.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/52503017345.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/218899222.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/14390617003.pdfIn PDF document text
    • http://elsped.hu/files/file/ruligagegep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=4+letter+words+starting+with+zoPDF link annotation
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/94492842577.pdfIn PDF document text
    • 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_off0000d65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65A 10652 bytes
SHA-256: 8480531511953e26f4bec56e2d7e129fc32f8754b395778fdece568588ced3b1
font_01_sfnt_off0000ee85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE85 19484 bytes
SHA-256: 4cdd7a395ae07da1c1ed45cf1182d05182bfe9a4c3f963d67b28bf366500ce18
font_02_sfnt_off0001210b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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