Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2e3d0b26ed5cfd3…

MALICIOUS

PDF

93.4 KB Created: 2021-09-11 04:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b175523c126d2f9e0b08632be231700e SHA-1: 5e64869e4ff6dc1b709ee6b0043733ff2d995225 SHA-256: c2e3d0b26ed5cfd3a40bc57ee1f3260f1d8da5c0d651f2ac8405224b920c5f43
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and acting as link farms, suggests a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically highlights the nature of these links, which are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://laborke.ru/uplcv?utm_term=superhero+city+apk+mod PDF link annotation
    • http://chickenwild.com/upload/contents/images/images/82621185956.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/53270950786.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/gatixobopamavibimig.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/revajobifuwuwivasimado.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd3aba18d1---vidabukilotokiziwijuxe.pdfIn PDF document text
    • https://angem.fr/userfiles/file/3610827444.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/25460610487.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/fupolitezagi.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/jemekorozazafopeneram.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/93601635360.pdfIn PDF document text
    • https://marmetal.cevhertemizlik.com/userfiles/files/5823672913.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/81410620345.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374b157d92e---3513993477.pdfIn PDF document text
    • https://armature.ir/cache/fck_files/file/59583385387.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/97395528820.pdfIn PDF document text
    • https://ajambary.com/userfiles/file/75722896991.pdfIn PDF document text
    • http://elsped.hu/files/file/mefubo.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/roferu.pdfIn PDF document text
    • https://dampinggame.com/calisma2/files/uploads/8281939466.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/42397202941.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/xewivogimupejisega.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/vowidaz.pdfIn PDF document text
    • http://viorina-deko.com/images/file/58197648367.pdfIn PDF document text
    • http://xhzhengli.com/upload/79343264108.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00013183.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13183 18576 bytes
SHA-256: 1884f829f0dd3c2e17575785082cdebc93f3a5f4585286069834f8acd92f6043
font_00_sfnt_off0000de47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE47 10840 bytes
SHA-256: 8cd94e923d41815bae85cad450b0cb8a3ae4667bcb19a963a48d0863dbac0540
font_01_sfnt_off0000f75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75D 22204 bytes
SHA-256: 972d6ffcf932007390edc690419add092da31ff266885ddb20a51e13578abacd
font_03_sfnt_off00014f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1