Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae2ea3b74df64f23…

MALICIOUS

PDF

72.0 KB Created: 2021-09-12 22:31:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3bacf7d661346ce7554c5c8d7cf124b6 SHA-1: cf3198e1fb4bdfdbb741b3d95f2a136de0ba7190 SHA-256: ae2ea3b74df64f23c54eb89a2a7dd072a977a531864f7b210599297a46cceac7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of the PDF being used for phishing or malware distribution by hosting numerous links on disposable domains. The embedded JavaScript likely redirects the user to one of these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://chaitraglaze.com/uploads/56738922500.pdf In PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/64627741874.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/72769532199.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/mulojejozosivupamotufemu.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/1298718395a6d7d2a449d19ffa608db9/vuvijusuxilezefi.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/19449904743.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/jepumenoliwubitubi.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/vibulurisorojagupef.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/16266605614.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/bexotufedigoviwede.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/20415543334.pdfIn PDF document text
    • https://mavibusiness.it/file/musopamomug.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/gipelilazevogugupixoweku.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/toridoxukuwetis.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/volepodiraduripotos.pdfIn PDF document text
    • http://twsl.mingann.info/upload/ckfinder_temp/files/20210910162326.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e71730d3f---45874374806.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/lilolexun.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/purira.pdfIn PDF document text
    • https://resicolor.com/upload/files/6320896475.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/61164373955.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/toxuveburixasuponurodu.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/43198982666.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/69841170523.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=android+unblock+private+numbersPDF link annotation
    • 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_off0000b7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B3 11056 bytes
SHA-256: 8220e7d5bf65e09c6473dba1246e764e5f97d2fdb93bd34086385862359c96e4
font_01_sfnt_off0000d140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD140 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE952 16064 bytes
SHA-256: 85a071a9d361a0b9ec326a5862093ed83c52c445d29029d650d9bfad7d2ebe5d