Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8fa8eb0f9d3ebba…

MALICIOUS

PDF

93.3 KB Created: 2021-09-23 12:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 214005e8198b7790c7d07320ddc5823b SHA-1: 2930f426438f1cf0fb55b1f4d3e4b6726aa55b2b SHA-256: b8fa8eb0f9d3ebbac03854494b7279cc44f78321969f06b0d004930a38e9a06b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or redirection scheme. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs point towards techniques used for initial access and potentially further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 https://galaxy-training.com/userfiles/file/16444765286.pdf In PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/e42489019c5d25f114cee3369265c455/zunafanukujoli.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/nejujujofoxojopuwupazozeb.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/rulesetulogubo.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/45058384317.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/pepudiwobajizuva.pdfIn PDF document text
    • https://maurinet.com/userfiles/file/tabenatosidojesewix.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/65585082333.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/xuwobilex.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/kuxirosotigobosud.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/74093376450.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/foram.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/pawojikofokezi.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/17047772171.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/48347598192.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/nefoku.pdfIn PDF document text
    • http://chikatere.com/Upload/files/nefovikozikuroro.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/79109583606.pdfIn PDF document text
    • https://gogreenonline.net/userfiles/image/fckeditor/file/64257586848.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16137c3209a282---wibenuwisidejer.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/sobotulijoxavezogi.pdfIn PDF document text
    • http://dzbnf.com/upload/file///36591718099.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210923141119.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=letting+go+movie+2020PDF 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_off00010b49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B49 17868 bytes
SHA-256: 8487a8089229feaa116f65b814abe8698434d75aa5146510999d0049ccaa1c39
font_01_sfnt_off000139b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000151c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151C9 10240 bytes
SHA-256: 5492611a4b4f9f603c099192ce80acf74c222370a07a50ecc6d0738b89ecfba9