Malicious PDF — malware analysis report

Static analysis result for SHA-256 386f507eeb71e071…

MALICIOUS

PDF

71.6 KB Created: 2021-09-11 13:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b693f3fc4c5fbbdb76baed8b6aeed28f SHA-1: a5f9f51cc0c9508df7d5a426beab0178bc509d97 SHA-256: 386f507eeb71e0711a10fcb416657dba691e8c70203b856b7961cd2772b42225
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs, many of which are hosted on potentially disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://lubrifianti-auto.ro/files/file/lamigifuz.pdf In PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c6ef6652ea6bd5ea87cba1af5c2bd748/dumovekemebavofuso.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/dawovago.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/27313392080.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/16358895314.pdfIn PDF document text
    • http://partnercable.hu/files/66472801356.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/fupubem.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210905_035330.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/36107896179.pdfIn PDF document text
    • https://whereestar.com/marinarubicon/admin/file/41674385325.pdfIn PDF document text
    • https://orrizon.ru/images/file/disok.pdfIn PDF document text
    • http://njchemland.com/upload/files/58459276068.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/63971106310.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/miwed.pdfIn PDF document text
    • http://metall-press.ru/files/xaximijif.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/lonewaxuwutijepirop.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/dovalurejemivupasi.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/dofupisobuvilewefadaxaxi.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/44381249646.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134bbab213ec---luxamidugo.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/19978007633.pdfIn PDF document text
    • http://jonme.net/ckupload/files/kuxepokodepubavozibusizaf.pdfIn PDF document text
    • https://projetovm.com/uploads/files/34493419978.pdfIn PDF document text
    • http://bfttacg.marketsearching.com/upload/files/93063165847.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/rusajumita.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=side+by+side+column+graphPDF 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_off0000b656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB656 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6D 11292 bytes
SHA-256: 68d4687af4baa67d339a766d39eef0e47544404712db87ddc6a7ed9fc0e4010f
font_02_sfnt_off0000e83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83C 15876 bytes
SHA-256: bb3bd29da9aa6d00d211288e630bc5a4cf77dfe2b6b5cd1f97f790f76b36e6f4