Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f84cc1b0dcf37cd…

MALICIOUS

PDF

72.1 KB Created: 2021-09-27 17:17:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 56466fbe883773018df3782d9f78767d SHA-1: b59ca911ebcaa5e87f0a1b84e06754d7c0185523 SHA-256: 0f84cc1b0dcf37cd77a019d1cc38dc5236eb4634039c50642b065f56620fc03e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a heuristic firing indicates it's a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated, but the presence of numerous external URIs points to the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://philabc.ru/uplcv?utm_term=resize+image+in+android+studio
    • http://mnarch.it/userfiles/files/28054638353.pdf
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/kodebopuvodovil.pdf
    • https://parisnordmedical.fr/docs/file/wapepubipimofu.pdf
    • https://tanthueviet.vn/img_data/files/buvonuxisafosonodulitu.pdf
    • http://whygzy.com/Media/Uploads/files/bubepabi.pdf
    • https://speedwayinfo.hu/uploads/file/40601729875.pdf
    • http://lednotice.com/userData/board/file/sojedovuridimiriw.pdf
    • http://shangrilayunnan.com/ckfinder/userfiles/files/kufewotefelimi.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/23835011203.pdf
    • http://globalbizkorea.com/userData/board/file/refepebivizij.pdf
    • http://icltindia.in/userfiles/file/xivaxisusipe.pdf
    • https://cornerstonelaw.eu/userfiles/file/17655264599.pdf
    • https://hsse.hssanesteban.cl/files/garebagumo.pdf
    • http://mega-treid.com/userfiles/files/39826672748.pdf
    • https://computerzone.pk/file/99638933262.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613125c06b861---xalojavevav.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae520a68f2---loveb.pdf
    • https://luxesystem.site/js/ckfinder/userfiles/files/55709167107.pdf
    • http://hyundainhapkhau.net/upload/files/xifofakafebi.pdf
    • https://nacituran.com/userfiles/file/1312075760.pdf
    • https://mgs-on-track.com/uploads/misc/files/26575331929.pdf
    • http://efuturesthai.com/uploads/files/wurawobesaxexetut.pdf
    • http://bentleyplemtech.ru/userfiles/file/30440560137.pdf
    • https://777mto.info/contents/files/56530535523.pdf
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/53723454432.pdf
    • http://longruiglass.com/ckfinder/userfiles/files/20210903_060445.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b63e.bin
d39ef6d42e2dff8cf12cfa454e29364f78b338733e44e72d53b952baa820cc30		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB63E 17040 bytes
font_01_sfnt_off0000e1b6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B6 16792 bytes
font_02_sfnt_off0000f9cd.bin
8e80a01fd1a29c1bb1e0211e8ad57b7ecc361995b7100816522e99d76bf9f669		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CD 10752 bytes

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