Malicious PDF — malware analysis report

Static analysis result for SHA-256 27ac26f45808aa48…

MALICIOUS

PDF

82.3 KB Created: 2021-09-11 13:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: de1b80b3c85b2f253d8ab54cb284bea9 SHA-1: ed218fa78bf3d28a9a3d1f84d8f2d357bea02b1e SHA-256: 27ac26f45808aa4877d08f6a2de190c555f6ffe9847e1f14579ff1430f6e8ee4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://synerhu.ru/uplcv?utm_term=last+hope+zombie+war+mod+apk PDF link annotation
    • https://butagallery.com/userfiles/files/nepipovazezesikigorofugot.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/74327040215.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/52102666059.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/jubiko.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/28716046881.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/metewu.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/mibojalobibelixiju.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45893611110.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/pevubexuwugu.pdfIn PDF document text
    • http://rayer.cn/d/files/tegezevorusu.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/19669660271.pdfIn PDF document text
    • http://trubaopt.ru/content/file/88702242965.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/63483849947.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/76567943824.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/11654166928.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/sinowu.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/70919123089.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/migok.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/67827252589.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210909_3F4A09C80F8660FC.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/93907712313.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/bolenunex.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/0medone9t2dtinekm3qbfdf05v/mukeseb.pdfIn PDF document text
    • http://twilaw.com/files/files/nifawokufob.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/sirataniromepuzirebesa.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_off0000dca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA6 17992 bytes
SHA-256: 954f11d89e60ee2c21d5ccdf35a0dff4d4d63af9c72ad798017ad781dfca9ea2
font_01_sfnt_off00010ae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FE 10844 bytes
SHA-256: 9a365a62e26f251e7e6e34c4898eeb7fe4609d9eb64f80cbd13386c59fb00256

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