Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a4c823b0a9eb193…

MALICIOUS

PDF

70.8 KB Created: 2021-09-29 02:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 484e7255b33d7d90996391af1906d7f2 SHA-1: 19558501e1e77fbcde5fcfeb05ada93d2ae63e7f SHA-256: 5a4c823b0a9eb193cb5cd3f448216863633a78edadc0c562f20a1cb3d09171f7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=vita+apk+download PDF link annotation
    • http://metabolit-plus.ru/files/file/19592482174.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/42617788116.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/94448765075.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/8134020493.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/pawulatupetajulifemekeses.pdfIn PDF document text
    • http://arnoldbolingbroke.com/ckfinder/userfiles/files/51283381046.pdfIn PDF document text
    • https://stopserv.ru/files/file/42299146298.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/juriv.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/69690068036.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/19922754950.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/89423689355.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/xaduk.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/sifediludimuzudixitesatu.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/dipubetaged.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/mugitizitilewefuluviforig.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/10598704795.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/21760903407.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/27141201196.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/39799187191.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/161462f59e5a99---liganajul.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/87826104483.pdfIn PDF document text
    • https://strefaokazji.pl/uploaded/file/38183744711.pdfIn PDF document text
    • http://seasonmediagroup.com/pic/file/kugojonidawiretudiserare.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613847ccf1e57---22027105730.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_off0000b327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB327 17196 bytes
SHA-256: 1137d23d77ba5b1e2b397939b2e45598975b91efd98c1d7e084d1d4b0837ff48
font_01_sfnt_off0000df54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76B 10132 bytes
SHA-256: 572206aa097860dadf06a3219a83358df5d663cfc3dab40aa8dde0692fea87ec

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