Malicious PDF — malware analysis report

Static analysis result for SHA-256 19df7ff0866057e9…

MALICIOUS

PDF

79.2 KB Created: 2021-09-21 04:36:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: afe11beb63a97236f390472bbea96e21 SHA-1: fce61a8f3f7c5479b789672ffc7ad01c0bb69333 SHA-256: 19df7ff0866057e9780a9f44164eefa50660305e6926f5e1692efaf830af73fe
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://garglob.ru/uplcv?utm_term=10+examples+of+modals PDF link annotation
    • http://jpind.pl/userfiles/file/36887788803.pdfIn PDF document text
    • https://priscar.com/documents/files/kivikesimep.pdfIn PDF document text
    • http://xtra360.net/campannas/file/sosedite.pdfIn PDF document text
    • https://seger.cz/userfiles/file/22150936843.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/dipenibene.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///zuxodevuwuvinogo.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/gudazetuvota.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/64357184390.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/kegejobavisunaganazoz.pdfIn PDF document text
    • https://lalicorne-hotel.com/userfiles/file/zazijuwakagefeg.pdfIn PDF document text
    • http://artiguardia.pl/userfiles/file/2586802714.pdfIn PDF document text
    • http://domplus.su/userfiles/files/2893509848.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20210907052607_133802191.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-14/images/files/wimalib.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/nigirinulerawuzudamabux.pdfIn PDF document text
    • http://ombs.ru/uploads/files/80711186222.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/gudosowi.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/xokiko.pdfIn PDF document text
    • https://zagi.hr/files/vajazofeloti.pdfIn PDF document text
    • https://rais.bg/uploads/file/45644211232.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/32094186114.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a40cc99c7d---zavivivozupakizok.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/11278696278.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_off0000d114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD114 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE926 17856 bytes
SHA-256: 383a8ef781cb12050fcc414109d9773881ab07ad0614901631e638c34c7fe4e6
font_02_sfnt_off000117a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A1 10444 bytes
SHA-256: 869e31847e31567da74d2f7c62128e6675f460ba5b8e6908d5f851e89c60e4f0

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