Malicious PDF — malware analysis report

Static analysis result for SHA-256 de108e9600fa5df5…

MALICIOUS

PDF

76.0 KB Created: 2021-09-17 23:36:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dd108fdbba89437a3a2ec0d5ed31e938 SHA-1: 0b65ca33ec57d226d85701df1dc7ff52ceb5be2f SHA-256: de108e9600fa5df5357b83b16505f877e40bddf20a626a53bc4884afef7c05c0
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The sample is a PDF containing embedded JavaScript and numerous external URLs, many of which point to link farms or potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the download or redirection to malicious content, aligning with Ingress Tool Transfer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pixomot.ru/uplcv?utm_term=best+adblock+for+chrome+ios PDF link annotation
    • https://nvsrolko.org/ckfinder/userfiles/files/71957378713.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/fifij.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/bitewodiguwewelisu.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/jodavonudusuwadosepokad.pdfIn PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/beputilu.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6af5a31dd---21345839421.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/81051191590.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/muruberewezumazonomuzude.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/5294426585.pdfIn PDF document text
    • https://edarky.net/data/file/84294810947.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/86b99b577c78b565976a36ed07eac6ea/72932761155.pdfIn PDF document text
    • http://talesma.com/E/file/10831224915.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/kuxamoli.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/zikanifenigetadevav.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210902124346.pdfIn PDF document text
    • http://quiltingacademy.net/fckeditor/userfiles/file/sigixipewazik.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/70847613101.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/zenarexara.pdfIn PDF document text
    • http://soc-in.com/data/media/files/kasinen.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/10322262963.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/silajaxidadibaletekira.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/60284486399.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/71224598809.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_off0000c40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC40C 10924 bytes
SHA-256: cbde77193a22867fd401ccf91770090dde2509f90c773aa6052e717e2d85dc82
font_01_sfnt_off0000dd5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5F 17476 bytes
SHA-256: 4d1ffa335fe2de4ac904f757d6599987dc47d4f2e6c2caa6b06f015f627475b5
font_02_sfnt_off00010ad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1