Malicious PDF — malware analysis report

Static analysis result for SHA-256 1536750f1bd5beeb…

MALICIOUS

PDF

79.1 KB Created: 2021-09-20 14:30:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d172ed6fbf25056205782c220302ad2b SHA-1: eaa068712d7b75c6b2927a110d3db982d53dd673 SHA-256: 1536750f1bd5beeb57a0dd6140ef80e76eff44e2e01c123866a4ec7e6eff08ab
126 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, indicating a likely attempt to manipulate search engine results or distribute further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • 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.
  • 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://reparation-mobile.net/userfiles/file/jidelus.pdf In PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/fuxatabijetan.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/papifatiw.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147867d05a09---85713379003.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/163184243363160401519.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210912142530499.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/61713695330.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/20477793777.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/2fa638c6ce63e830d25ffefcba487a6e/23727125309.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/jilolomala.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/zigutufanula.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/wanofukapikor.pdfIn PDF document text
    • https://cardolf.ro/files/67475420573.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/ligojoledufavomakixul.pdfIn PDF document text
    • http://demo-enriquemora.shopcloud.es/ckfinder/userfiles/files/60347362859.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/44948591260.pdfIn PDF document text
    • https://tunguoilon.tunhua.vn/ipp/images/uploads/files/jikefatef.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/73007876823.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/83600423930.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/rififosiduk.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/pizujine.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/raruwumilaro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=secure+wipe+androidPDF 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_off0000d1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BF 17696 bytes
SHA-256: ee591584abf4a4a9952c1c70ad68cc9fad08614978fb99e17ad3cd637cc8704f
font_01_sfnt_off0000ff74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF74 10456 bytes
SHA-256: 1133c2e5b6cf2e7a02a5ee8ad662bc7965c609b6ffa1be1223675c09bb7429d2
font_02_sfnt_off00011752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11752 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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