Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fd27101c969eeb7…

MALICIOUS

PDF

81.3 KB Created: 2021-09-16 21:55:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9623a8670f06733c8f0ab72b86200bd5 SHA-1: 0734b2b2e1606200cb25d6fe87fd761a58fe2b29 SHA-256: 5fd27101c969eeb7cca5f07fbf92c479aa1dc60ee7c1a152c14a6c6a8540e11f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which are hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish for information. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

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 http://madmojo.com/fckupload/file/kulezaminopameralek.pdf In PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/muzupukejupanukomig.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44743851204.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210913040317.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/6839f7cc85316bc2710474159c243378/6558673336.pdfIn PDF document text
    • https://peterdegendt.be/file/pifexivemat.pdfIn PDF document text
    • http://eegbiofeedback-leszno.pl/userfiles/file/fedotekojilusup.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/ralawibimar.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/88764318460.pdfIn PDF document text
    • http://takramaipai.com/mypicture/file/webogamapozoweram.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-15/20210915215612896385.pdfIn PDF document text
    • http://sdds.be/userfiles/file/nizeferomelabiribupus.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/34883855478.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/rawemirenalibekalepa.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/81287668755.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/49484871301.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/toporipixi.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/zotanusuv.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/3a65973d620ddbf35481cd4ecf3eeeec/5611217833.pdfIn PDF document text
    • https://turkeyinsurance.info/images/file/miluruwalupimewawa.pdfIn PDF document text
    • http://jamones-luna.shopcloud.es/ckfinder/userfiles/files/81312036921.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/35405804750.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/88733602164.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=messenger+change+keyboard+languagePDF 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_off0000d833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD833 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04A 10900 bytes
SHA-256: eb86d95752308ba6ccc09038f8700efa3d308a1e512306b730a69175d91d1cf4
font_02_sfnt_off00010940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10940 17796 bytes
SHA-256: f06ba14f0bee3adc1d2e0fbe7432fffd1351a6eb9882dba14717060a494bd106