Malicious PDF — malware analysis report

Static analysis result for SHA-256 e86716dfb696015a…

MALICIOUS

PDF

71.8 KB Created: 2021-09-12 20:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dda528f3924b4607860777c6d3f78cd6 SHA-1: 5700ba3d0fd439e62bd0ac95cc8823ca6aeafaf8 SHA-256: e86716dfb696015a0acc0bc5602c085bad51a8412b517bbd6f454678657b446c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicating a high concentration of links on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, not user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://dxline.eu/userfiles/file/xizalarapujekekujojefimob.pdf In PDF document text
    • https://bilegt.mn/userfiles/files/zironojurenoxeluxa.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/givibuxebonesezexomufabu.pdfIn PDF document text
    • http://taxfreepoint.com/file/kivozunamugobixofitikafor.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/72585151897.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/kidudu.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/pafokiva.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/jonevivanivotatiwewilig.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/08be7cfbf987550ce53df8013e74a04f/desarijukazafegeno.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/nobovokatebo.pdfIn PDF document text
    • http://prompol.com/media/file/kudosotugobuxutagotejumak.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5f764349rm6oa9dsqh3sdejes4/30714995347.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/43278639907.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/xusus.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/buponune.pdfIn PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/63522188673.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/55426858457.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/52452470149.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/fuxotupasexofevibofaluxox.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/fawaxizafomor.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210906163096567380.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210904171526.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/ruwoxevuku.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/11942603776.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=nora+roberts+ebooks+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_off0000b6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF00 10552 bytes
SHA-256: c53aac86b62743dcf4f366265576881b6bfc065ab8e7236fccafee1cb2807992
font_02_sfnt_off0000e74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74A 16632 bytes
SHA-256: d3726ecc849ee5ca90eb6d4c308e5f901e838a0f374b6390cc8831db0ee56934