Malicious PDF — malware analysis report

Static analysis result for SHA-256 676c191bae2a2aa6…

MALICIOUS

PDF

82.3 KB Created: 2021-09-15 13:34:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 64486f0ea52940feac44814fa7acf790 SHA-1: 9be752c1586d53f02f968e88597031d3fcca6821 SHA-256: 676c191bae2a2aa677e5ce1ddc6094f902f18e094eabf04dc482aeaf6a1982b2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, strongly suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection further support the malicious nature of the file.

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://hram-uspeniya.ru/ckfinder/userfiles/files/bujib.pdf In PDF document text
    • https://brillimet.com/uploads/files/202109061749329084.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/97804946158.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/42777856780.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/movofuwibuwivalawunivava.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/80315989538.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/46621874943.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/1525739916.pdfIn PDF document text
    • https://eniedu.com/data/file/20210904095244.pdfIn PDF document text
    • http://119pump.net/d/files/22233702723.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/79091426789.pdfIn PDF document text
    • https://reha.bg/content/upload/file/91886932343.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/musinekajuzude.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/pogotolo.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/83eda51c6d4d89a259ca38d68b06e5c5/zumagulu.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/10549281946.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/wobatopibozikafujeperadik.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/kamolosafezowediwokiwuzot.pdfIn PDF document text
    • http://showpelec.com/data/file/20210909_112237_355.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/67577283788.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/nm9nirjjnl5pph7ecahp7ucuh4/17003966022.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/56180083218.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/kirabegujinira.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=next+launcher+apk+free+downloadPDF 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_off0000db4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4E 18196 bytes
SHA-256: 8b630b84f11b5f760028084bcea3b8245dc63d75d663b2e49e02fb38e69ecc67
font_01_sfnt_off00010a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6B 10812 bytes
SHA-256: ff37ce09529a5f9d3477d8d0ce08974d7cc51ead8574e17698c7252472ad467d
font_02_sfnt_off0001235f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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