Malicious PDF — malware analysis report

Static analysis result for SHA-256 7827ef4f5e018641…

MALICIOUS

PDF

72.5 KB Created: 2021-09-13 00:32:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: d3dd741273caa1f447a8d3d497929f81 SHA-1: 4cd874daa8a9410fa92663346f587cbfbe44632f SHA-256: 7827ef4f5e018641206568fc7c7d4e056b68aa43274f4ba5c64ecb3500d77255
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to potentially disposable domains, suggests a link farm or phishing lure. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ofertaromania.ro/ckfinder/userfiles/files/1380667777.pdf In PDF document text
    • http://kruengrangthai.com/files/files/dojegobufedoximalejowa.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/wazisifosumefosirapikevot.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/54689270415.pdfIn PDF document text
    • http://xn--spreewaldpension-lbben-9lc.de/meineBilderAlbertGrundschule/file/76829176571.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/46410064985.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/sewusilezexeg.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/popigeviwigomozar.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/rolute.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/79316888566.pdfIn PDF document text
    • http://hzxf.com/images/upload/File/gevazovusulun.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/tuguropikenevovonitoweji.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/82518518866.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/dixuxinanone.pdfIn PDF document text
    • http://bbmpva.nl/fckassets/file/gowajanixepabuponej.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210902042022_dbtccf.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/vogowepubufogizomanujon.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/33889599774.pdfIn PDF document text
    • https://felicityokolo.com/file/24100662928.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/sigoxun.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/wizopezikeromub.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe1c038f49---navezasomepesotile.pdfIn PDF document text
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/sodejalalubanagozixogo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=cluedo+game+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_off0000ba5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD276 10396 bytes
SHA-256: 6f3df3e25c98290734376c27c2fcd0973fe824f0eebf00c2b22b2f26de6f660d
font_02_sfnt_off0000e9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C7 16896 bytes
SHA-256: 03a7ccfa2c358f13e8ca38a8d5a618453c220a8b00a26110a968022f679a0339

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