Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dd424087dbff4bc…

MALICIOUS

PDF

88.8 KB Created: 2021-09-18 02:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d2386f74dc404ca52614e27a04c5bac4 SHA-1: db9beb2407af5d346eaf6f801dbe61d43a88a1a4 SHA-256: 8dd424087dbff4bc5d5dbc2ccc62d40a1b469363ef679ae94d2ebd595fe8cdb7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains embedded JavaScript and a large number of external URIs, many of which are hosted on potentially disposable domains, suggesting a link farm or phishing lure. The primary attack pattern involves embedding numerous links to external sites, likely to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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 http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210914_102033.pdf In PDF document text
    • https://relans-nn.ru/images/docs/file/temowusu.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/75795092846.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/vuxubofok.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/pasonakavi.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/47220628159.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/14638355965.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/wejetonufalo.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/24780573468.pdfIn PDF document text
    • https://landviewdesign.com/userfiles/file/roserajukojas.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021090822574218997.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16131fd772ba8b---betewobasura.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/xupiramebej.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/sepoguma.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/23722443107.pdfIn PDF document text
    • http://grimastone.ru/files/47405757230.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/lubomusi.pdfIn PDF document text
    • http://119pump.net/d/files/65352948637.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/95758563878.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/de522e62ee00dbb8804f3667cea4609b/kobopukut.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/jumonelenutezoxonife.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=uptown+funk+mp3+free+downloadPDF link annotation
    • https://mediacentre.heathrow.com/js/ckfinder/userfiles/files/kivitafofufuvaworeg.pdfIn PDF document text
    • 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_off0000f5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D7 17896 bytes
SHA-256: 219d86b6b0112a9ebce7550e048046dc0258755ec3f100eec349440c90e14554
font_01_sfnt_off000124b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B3 10856 bytes
SHA-256: 16f03e7bfea89fcf3055ddd896b432d7d24c7e27987f927cf214d8baa98ded40
font_02_sfnt_off00013dde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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