Malicious PDF — malware analysis report

Static analysis result for SHA-256 88ef7710bfcf5566…

MALICIOUS

PDF

80.0 KB Created: 2021-09-18 18:17:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dfe2e4fed58f8baa7e23522c7b612f64 SHA-1: 0405f6fa2e9ace4b4e777642e1197334153e4ab2 SHA-256: 88ef7710bfcf5566e17cf343d57e1ddeb24441331b805770b3a6877b0885458c
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 disposable domains and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting the user to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://windfreeklima.com/upload/ckfinder/files/zufesepa.pdf In PDF document text
    • http://phongthuydotho.vn/upload/files/30118708962.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137e9a5b967b---kititevapik.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/jojafukimakojaz.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144cdf7478b2---7108898430.pdfIn PDF document text
    • https://www.savininkai.lt/ckfinder/userfiles/files/37715709249.pdfIn PDF document text
    • https://equalitas.es/userfiles/file/ludepor.pdfIn PDF document text
    • http://ecole.ru/text/images/file/33182094238.pdfIn PDF document text
    • https://abhrian.com/userfiles/files/43671985062.pdfIn PDF document text
    • http://itexpertdog.nwoasis.com/upload/files/mibumujiketixuf.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/86019322722.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/ledonigajat.pdfIn PDF document text
    • https://funbugs.ie/userfiles/file/58938551858.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/lasopesaniwubogususejawuk.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/57326291628.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0475030001630745196.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/37472784926.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/titevixojuxiwevokuw.pdfIn PDF document text
    • http://becucci.it/userfiles/files/88325392040.pdfIn PDF document text
    • https://conviviodihera.it/dati/upload/file/4022816608.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/ladobinoputevevep.pdfIn PDF document text
    • http://neteyes.eu/editor_up/88942573879.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/bubamisumu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=kindle+email+convertPDF 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_off0000d683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD683 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE95 16912 bytes
SHA-256: 56decb115b4a21d84d8064e259eb0e679fc896b540ef4635c8cc3b7855b5475a
font_02_sfnt_off00011ab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB2 10420 bytes
SHA-256: ef2ad42580183d08087c0991707020d0f0a0e8af25317b69991c9ee1690afd18

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