Malicious PDF — malware analysis report

Static analysis result for SHA-256 36c8815827f425de…

MALICIOUS

PDF

68.6 KB Created: 2021-09-18 18:20:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 33d28aeef42d5d9a489ed8f0343cbc38 SHA-1: 3f7ac5742770c99baf2d2ce23674fe7e5932c172 SHA-256: 36c8815827f425de03cde102209f865b59091af4883ddfd78ef76ffd6952b15d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The numerous external URIs, many hosted on disposable domains, suggest a link farm or phishing lure designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://fantalife.nl/userfiles/file/49110156527.pdf In PDF document text
    • http://daltan.hu/userfiles/file/zatagilekinuren.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/56281440441.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/62605874075.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210905190436328703bgjzjc.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/32967656051.pdfIn PDF document text
    • http://all-premium.com/user_file/files/pawew.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/vezagabazogubos.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/35822495150.pdfIn PDF document text
    • http://surestegc.org/documentos/file/morevelebezexegedusej.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/degiwukemesamekowo.pdfIn PDF document text
    • http://someteme.com/archivos/_20210913084724.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/15907973758.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161368e7ff1248---lorinesosegunekafema.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/7hja5c36lfpfnannaqtoetm190/logevarisifose.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/10233646948.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/63151438349.pdfIn PDF document text
    • https://eastmangroup.org/ckfinder/userfiles/files/53434408590.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/jemiditipop.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/pifidekez.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/wuves.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/vikidogovu.pdfIn PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/26709065550.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=mk+movie+goroPDF 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_off0000af3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF3C 15672 bytes
SHA-256: f9a36c63aec5fa71fb9f84c212eb0593578325c5eeec784531ef7cb0ffe83497
font_01_sfnt_off0000d6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A7 10024 bytes
SHA-256: c7fd5c51f5f722962d80d1f54805d19466db8ec0292e2e0ed5c33e0eee7024fc
font_02_sfnt_off0000ece8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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