Malicious PDF — malware analysis report

Static analysis result for SHA-256 75de967397e37f60…

MALICIOUS

PDF

81.3 KB Created: 2021-09-17 16:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c883fea9efc11d9df0ee35f2e9108cae SHA-1: e501b93510cdd4907b4e476d36853e41dead55df SHA-256: 75de967397e37f606c86074dc37e9755d7fcceb252d6ea583d1bb49ea398c132
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. Several heuristics indicate malicious intent, including a high ML classifier score and ClamAV detection as a phishing trojan. The numerous external URIs suggest a link farm designed to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://huntic.ru/uplcv?utm_term=cara+membuat+gambar+3d+di+hp+android PDF link annotation
    • http://hatowo.com/app/webroot/uploads/files/jezoduturo.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/riwazawopidawin.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/50713460479.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/jorimesil.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/kesodagakelokipagib.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/sefejalogamudawojego.pdfIn PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/vevisawegilasefamiz.pdfIn PDF document text
    • http://vedepcuaem.com/luutru/files/paboxomugodotol.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/44778891193.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/bezebovi.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/81954063662.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/76828605383.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/57629398895.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/71676694250.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/374f40042d12141cc4f1fdac5073c9cc/53787580145.pdfIn PDF document text
    • http://radekslodkiewicz.pl/files/file/vawigexerepovet.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/bajilobabiweminefuporon.pdfIn PDF document text
    • http://giayviettri.com/img-ftec/files/mevosafapawiza.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161315abe21c84---18377571704.pdfIn PDF document text
    • http://sciattella.net/images/file/46167763261.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/72003967526.pdfIn PDF document text
    • https://www.savininkai.lt/ckfinder/userfiles/files/medimategujiletijodekubu.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/kukulaxodutub.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_off0000dac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC7 16628 bytes
SHA-256: 745020a050fba2b600f3a16da6ad55024a5c121801e88987877a48031284798d
font_01_sfnt_off0001063b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063B 11068 bytes
SHA-256: beb1e4aaf893e593a9d771aa2d25c47b1cef4ff592936583b8c3b10e8cf5a183
font_02_sfnt_off00011f70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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