Malicious PDF — malware analysis report

Static analysis result for SHA-256 032746d44ac791f5…

MALICIOUS

PDF

93.7 KB Created: 2021-09-12 19:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e6e73914d5afcfc4fd430277e62ed529 SHA-1: 01b210fd91849f4dfa1f17953898fdf892fe4f3e SHA-256: 032746d44ac791f5defd90de5cb6b1f5b51bd36034819cec35e6be56c58cc212
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggests this is a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://wastran.ru/uplcv?utm_term=android+add+event+to+calendar+without+intent PDF link annotation
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/mezokugokedupadevi.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/kibugajunatotufu.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/lusisetuf.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/11366192352.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/wukunagadozap.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/kefotexija.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/161386d1ac9234---77816148166.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/5519501456.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/vinezes.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/sapafipepe.pdfIn PDF document text
    • http://dworbieland.pl/userfiles/file/tapazudebu.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/26102308329.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/lufifilojelifoxisogazi.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/nirenuwa.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/zubanewadilitagugez.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/jawig.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/letatexum.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613771002beae---ganavosojenisulunozetar.pdfIn PDF document text
    • https://arerp.kr/data/file///fatoxojife.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/xofegajixemitajarosa.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/gojox.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/56421770607.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/pevob.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/tarodixeki.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_off000108e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E2 10532 bytes
SHA-256: cbc5188a8e603d75b162840bb79b214f1dbddfb78ff512191546739b2724745b
font_01_sfnt_off000120d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138E9 18136 bytes
SHA-256: d584f1a69d77e770c2bf677c73becfd449ea47bccfa62f7686cf12247516be4a