Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fd070b47fb0608f…

MALICIOUS

PDF

80.7 KB Created: 2021-09-24 11:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8399172ee013a106acd1023b2008b0fe SHA-1: 9963bebd012cd93426ce8332af41d9944da4a316 SHA-256: 9fd070b47fb0608f652ec5059667a458597abea60594459cf3810c2f236dc558
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external links, with a high-confidence heuristic flagging it as a link farm on disposable hosting. One specific link, 'https://childrencareandliteracysociety.org/userfiles/files/13049539693.pdf', is identified as algorithmically generated, suggesting a malicious intent to redirect users to potentially harmful content. The ML classifier and ClamAV detection further support its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://circolosilverblufitnessclub.eu/userfiles/files/werikunanasopumezedotex.pdf In PDF document text
    • http://ilovestory.com/upload/file/80534970771.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///73581730963.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/20091414937.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/xudugum.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/xipekuwobebun.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/13266544757.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/kujaxesuxupuxapolap.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/36369189637.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/somababofumuvirosaneb.pdfIn PDF document text
    • https://safetyhanoi.com/userfiles/file/77326850491.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/20562247928.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/fabenumelutamemuzipe.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/ronikowijumafipumeve.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/21782113150.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/82996264998.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/99261102947.pdfIn PDF document text
    • http://shopabrang.com/images/files/46759418334.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/13049539693.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161457367e98ac---97719096763.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16141ee272883a---febonekop.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/54660265104.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/denikewebogutofisukone.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/nimejet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=cleo+gold+gta+saPDF 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_off0000d962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD962 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF174 17396 bytes
SHA-256: bf5edc95ec153b5239f8ac15165b3426295afc2fcacae4e70d6dc8f8feb9b44c
font_02_sfnt_off00011ea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA3 10156 bytes
SHA-256: a27fe408c47fdf3d4ad65936420ccd91ffda44a7cfa87cffa1d7c5e85538c06b

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