Malicious PDF — malware analysis report

Static analysis result for SHA-256 db88adfbb055cfed…

MALICIOUS

PDF

73.6 KB Created: 2021-09-21 17:36:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 21d93f2540c06f7af82790d3d2888bea SHA-1: 623bdf953488ddea99d96589e5f24283416a5287 SHA-256: db88adfbb055cfed3cecec6be4c1285fc3a12780def09792152c21ab4104ad20
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are typical of lures designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fix2go.info/userfiles/file/92697676532.pdf In PDF document text
    • http://studioesflores.pl/obrazy/file/guvaka.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/88670304058.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/97545986551.pdfIn PDF document text
    • http://grimastone.ru/files/regovozevudozoliw.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/fafisizepurowegaz.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/rotugoxuxawewixinowumuba.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/1945284527.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/zibejufawutexo.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/zawuremujo.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f222f3bd1a---19233515703.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/powolezoju.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/37e57528b22efa5c548b58816b67f229/31229460786.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/27091476531.pdfIn PDF document text
    • http://nasledie-sluck.by/var/upload/file/budedupujimogizamarom.pdfIn PDF document text
    • http://evola.it/userfiles/files/ratazumeligemu.pdfIn PDF document text
    • https://micsys.in/userfiles/file/jofib.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109131425324456.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/75648373842.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/72737680747.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/gasavule.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=the+conjuring+3+soap2dayPDF 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_off0000bccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCCC 16336 bytes
SHA-256: 3c00dcca0d8d1438f6106a289825c5ffc35bbfc7eda93a4e456a1ce4ce32667c
font_01_sfnt_off0000e6b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B1 11248 bytes
SHA-256: c54d0dd96e72ac507a1ee22343efccbf4b279eac2144f263213c44d1291e5464
font_02_sfnt_off000100e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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