Malicious PDF — malware analysis report

Static analysis result for SHA-256 a658563db94d740a…

MALICIOUS

PDF

87.3 KB Created: 2021-09-20 11:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0b02bd3584059e35844b7c6fd591d82f SHA-1: 37fb3bb2482dfa0955b09b1c514edfc1daa63f4e SHA-256: a658563db94d740a7da4c5546236222ef36470936f37b845444d2a65e6306a25
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 embedded JavaScript likely facilitates the redirection to external URLs, such as the one found at 'smidgel.ru', which are often used for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://smidgel.ru/uplcv?utm_term=the+dark+knight+returns+pdf PDF link annotation
    • http://laptopcuhaiphong.vn/upload/files/solotawifosu.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/rodosiziwoteludavobawan.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/netojoxuxumubutewuvo.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/78542218743.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/xatituxejijavo.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/82606674322.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/83940627283.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/99302593278.pdfIn PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/pudutujedima.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/78759024261.pdfIn PDF document text
    • http://lmtechsolution.com/userfiles/peraragimon.pdfIn PDF document text
    • https://micsys.in/userfiles/file/74955303255.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/godesakof.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/161365b4aaeb18---23495251055.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/7565361086.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/febidem.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/danafilunasowopasajejura.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210912121621.pdfIn PDF document text
    • http://touchpanelpro.com/upload/files/72213704052.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/tufugilaxopipijenufisap.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/2021941911151864.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/46149802256.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/dapono.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/jivejotawuw.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_off0000f27e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27E 10764 bytes
SHA-256: 45c53333a05a77790ba172783037550137f3531d36612418fee6b289d7320372
font_01_sfnt_off00010b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B02 17376 bytes
SHA-256: 61c794d4bae6e2365e428c165363c892799e8e35d00933a5e4acf12db7bc45b1
font_02_sfnt_off0001377f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1377F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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