Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c479d5e16b5cbbc…

MALICIOUS

PDF

84.2 KB Created: 2021-09-13 12:15:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 61ede3a41a8936c412c32ecc79ee4faf SHA-1: e13640414a0f60965e3dfa87b1b95548aeef2119 SHA-256: 5c479d5e16b5cbbc96d13adc7a92fe15c6b1975ec4bab1e07ea5f0dff8ea2293
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript, though not fully analyzed due to obfuscation, is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://queure.ru/uplcv?utm_term=scrivere+app+android
    • http://www.musicboxpiano.com/contentfiles/migepumiwejalalivisi.pdf
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/87186305453.pdf
    • http://citadelcaralarms.com/userfiles/file/kasugut.pdf
    • http://szyoujin.com/UploadFile/file/20210910062737671.pdf
    • http://kientrucqhouse.com/uploads/image/files/15753833462.pdf
    • http://thailaundry.com/imgUpload/files/21268768773.pdf
    • http://artgrafika.cz/userfiles/file/xuwupifun.pdf
    • http://satyavnetworks.com/fck_upload_images/file/xopalijoxofat.pdf
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/74709357866.pdf
    • http://ecohort.com/userfiles/files/94676356960.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbdc9784ac---baloziv.pdf
    • https://flour.co.uk/ckfinder/userfiles/files/62606807480.pdf
    • http://world-green-hope.com/uploads/files/rarenuzibimapiniwe.pdf
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/gunajuxujigaxogexazobo.pdf
    • http://geofer.eu/userfiles/files/vimuvekejakimi.pdf
    • http://dlastudenta.org/Upload/file/dugijodozanuxuz.pdf
    • http://cosmik-kinoteatr.ru/sadm_files/fekikogi.pdf
    • http://aqbnb.com/uploadfile/file/80839662268.pdf
    • http://wienbildarchiv.com/upload_files/files/wimasologimemigaxomor.pdf
    • http://asja.ua/userfiles/file/lemurifepukexabifijef.pdf
    • http://www.fred-robin.com/ckfinder/userfiles/files/xubikofewududubemaxer.pdf
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/17111932417.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16131b94120f1b---mukutipafoguto.pdf
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/74540138612.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e77d.bin
dcc259ea039c2a1d91a7bee04425897f8fc298eae8187d383e416e3e77a67865		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE77D 17228 bytes
font_01_sfnt_off0001141e.bin
29a28b372e1bb5633785b738c3a31f2a8f41fd79ad80ad8bdaadb8711131c3f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1141E 10336 bytes
font_02_sfnt_off00012b8d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8D 16792 bytes

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