Malicious PDF — malware analysis report

Static analysis result for SHA-256 499cbab5d68ce4ab…

MALICIOUS

PDF

80.2 KB Created: 2021-10-07 04:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 29e873b1269c74807536d9aba26f7426 SHA-1: f725c3b6653f83de61617dfe3ffe76a837ab7c49 SHA-256: 499cbab5d68ce4ab04aea6dc281c327d6f1918829bc837dd49ea84d82cf6393d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to potentially malicious or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript suggests an attempt to execute code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/vefulaw.pdf In PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/33694175372.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/21681281549.pdfIn PDF document text
    • https://pmo.jot-solutions.com/files/zorenufituxewirorezup.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/34150908892.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/fibid.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/2274943218.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/37713070423.pdfIn PDF document text
    • http://dytac.hk/userfiles/92187221367.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/48513630858.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/sefejugopokezid.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/zojig.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/kanivimeduleka.pdfIn PDF document text
    • http://xn--lv0az70cxar.tw/uploads/files/202109020646044068.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/78147267069.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/72516149736.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/kugebiwaxaleraguwojurowo.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/setivazonazupipejumimub.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/seves.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/tesetebaj.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1614cf7b199dd1---96174960031.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/47350879142.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/75529298970.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/54608758747.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=thirty+seven+thousandPDF 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_off0000d44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44A 18056 bytes
SHA-256: a0eb9808e38303f35b4f5e035ce6cc86b8c93180e94b967c939f6336d9571a4d
font_01_sfnt_off0001031a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031A 10544 bytes
SHA-256: 64b002bceaeb0a209e2e4a53c0b085cd65adececd53be313a915b06f0d3e0c1b
font_02_sfnt_off00011b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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