Malicious PDF — malware analysis report

Static analysis result for SHA-256 6679514da09618d1…

MALICIOUS

PDF

71.2 KB Created: 2021-09-28 10:28:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e0ff376ced946547dd6225df81f71823 SHA-1: 4fc32f086b8ca0079aff0228225b02887eb6bbcc SHA-256: 6679514da09618d1f563dd528dd6ed7821e287f2b74c934d336efcb69a3ed82d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for delivering malicious content or redirecting users to malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent. The sample leverages numerous URLs, suggesting a phishing or malware distribution campaign, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://oniceh.ru/uplcv?utm_term=chrome+on+android+keeps+opening+ads PDF link annotation
    • https://uat-tunisia.com/userfiles/file/wizanenijuxizok.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/33394294737.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0476587001632433928.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/91070500964.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69950938162.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/48695490714.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/fumugituta.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/jodelawifujalixox.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/magetotixuvifokolukozen.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/sadoniminumulibebamidux.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/92216476136.pdfIn PDF document text
    • http://vodova51-53.cz/files/toluxibezizu.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/sisunonu.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/41403746784.pdfIn PDF document text
    • https://nasikampung.info/contents/files/gomufiwomomoxilu.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50455855351.pdfIn PDF document text
    • https://kralpin.com/calisma2/files/uploads/63609354473.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/golaxe.pdfIn PDF document text
    • http://kdekdyjak.cz/data/57907258627.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/zabusixofagadi.pdfIn PDF document text
    • https://twinscooking.nl/twins/userfiles/file/depajo.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/tiwipekubarabuwunorig.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_off0000b3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A2 10820 bytes
SHA-256: fc30387bb76ff8355deccff950eb37bbc0bb04e90655ef52c32c1e9f6013c4e3
font_01_sfnt_off0000cc2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2A 16676 bytes
SHA-256: 1a2d6270a623b7b4c0b751b3d45c9336bde547b6b49bb34d1ece698d0c639111
font_02_sfnt_off0000f6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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