Malicious PDF — malware analysis report

Static analysis result for SHA-256 f68fa11b872461b3…

MALICIOUS

PDF

71.9 KB Created: 2021-09-20 20:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4039409885e2c33b8c7978b6d016651d SHA-1: d9fab9cdf91b78e3b4857a12fef91c05a0da07e9 SHA-256: f68fa11b872461b3999f35f9e2cbb3291e3dd45cb0800afa53c3ae863efd0317
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and exhibits characteristics of a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high likelihood of malicious intent through deceptive linking.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://szilasfood.hu/pic_upload/files/82120432177.pdf In PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613720197e89b---3506879802.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/wigonifofi.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/47107752.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210902211712.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/1153384968.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/webigipomot.pdfIn PDF document text
    • https://francemonde.news/UserFiles/file/22383150367.pdfIn PDF document text
    • http://stfurnimart.com/file_media/file_image/file/75737140850.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/mamazufupiweke.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/47709043616.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/nirisadijawusibowavuber.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/80674647505.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/20847664731.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/zirodakemopajilojile.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/567296750dcbae453dc5c8b058264863/zetiwupipinu.pdfIn PDF document text
    • http://wgadget.com/file_media/file_image/file/50568927804.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/66522095685.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/nilewitipodutinomesixo.pdfIn PDF document text
    • http://thecuriosityshot.com/46506142817.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/41000765205.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/57305226760.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/sodijijofokuregurajesajo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=it+felt+like+love+full+movie+onlinePDF 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_off0000b820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB820 17004 bytes
SHA-256: cdf668bf07df5a3e6c8df8ee9cf6ad505bdc25ad1b9d5dcccc50d899c74d3074
font_01_sfnt_off0000e330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE330 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB47 10156 bytes
SHA-256: b5474d70ea797a796c7b2aa83c41e4c998c374b2830381249dc930d5fb6a0b75

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