Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5a53c30188d6d6c…

MALICIOUS

PDF

78.9 KB Created: 2021-09-17 06:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c79b49d366cd7d5beaf8432d0333fdad SHA-1: 70f462998d963749c29736ed7ac36c6436182dbe SHA-256: a5a53c30188d6d6c41722ff52a42094560d78255b671360c42d195c8303d14a9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to disposable domains or 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 used to facilitate the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/vutoxupagoweda.pdf In PDF document text
    • http://artattack-concerts.de/files/file/97646243829.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/55398496110.pdfIn PDF document text
    • http://snft.ro/media/file/popunukuramigigigugetopaj.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/ganupo.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/37650285845.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/loxag.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/xogigikoga.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/raroxilejifijufogarebo.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021091617315680554.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/74454793223.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/samozato.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/newisopid.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/96058936917.pdfIn PDF document text
    • http://gymostrov.eu/gymostrov/userfiles/file/90326964806.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341632551aa---96784955211.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/diwovaxawerofogezi.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/13127630082.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/161408338ac665---xokoz.pdfIn PDF document text
    • http://tartak-monis.pl/tartak/images/file/kosunuwab.pdfIn PDF document text
    • http://kme-kme.cz/files/file/26320210128.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/20404733282.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=negative+and+interrogative+sentences+exercises+pdfPDF 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_off0000d05c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD05C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE873 10896 bytes
SHA-256: 2d5b61e877f0544bd5b6f9bfd1710fb14fffb9d1af2aff67f557dfafb7002bd4
font_02_sfnt_off000101a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A2 17088 bytes
SHA-256: feee11cbed7190d02e01f58be68d940139d42cdf0d25d540812d6714c6880fd5

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