Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a1c16eb4a840d16…

MALICIOUS

PDF

79.1 KB Created: 2021-09-16 19:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b25d59ef3c2f0ba7a5095b5aa0b09615 SHA-1: 4a7c42271e1f807c6ce4dcf65fcb39aaba86a425 SHA-256: 2a1c16eb4a840d160c3a6a439a452e6814b0a195808499905fea4004a8645a62
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The presence of numerous external links, many pointing to potentially disposable domains, suggests a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware.

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://metrominicabs.com/survey/userfiles/files/bapokuse.pdf In PDF document text
    • https://betenenergy.com/sites/default/files/file/45490059142.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/81264738039.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/359d4c0cd0cd29a57efbcecdb77e4006/loziruba.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/namowoxuferid.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/87861824465.pdfIn PDF document text
    • http://ty-int.com/files/files/16546249367.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/23329225177.pdfIn PDF document text
    • http://101balkon.ru/upload/files/20195909126.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/jidazamobawo.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/ditepatowawujoredowerinar.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/48210498868.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/lojomuxoxodibojoj.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/99182310359.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/tesufemixipebewel.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/jamejewisemugirowigeru.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/tibojilugubedigogotemu.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/24525776693.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/89590447596.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/vefijafuwuti.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/1295613900.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/5069170478.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/xitexumevowugolemugawuf.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/xokotolegizekopaguvuma.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/gugebofekenememadolasowop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=best+app+for+transferring+data+from+android+to+iphonePDF 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_off0000d04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04E 10952 bytes
SHA-256: e1d2c786483c3919b3928584cae391aae3a178a191b5ea4080a6c76466d9a6b3
font_01_sfnt_off0000e954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE954 17284 bytes
SHA-256: f59b3656e84f4c040a39a066f27cb30b4f6c1bc4c5e5da53aec44d11bb9ae64b
font_02_sfnt_off00011600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11600 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1