Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb42cff674e81335…

MALICIOUS

PDF

82.5 KB Created: 2021-09-10 07:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c130c6d76cbe7fe00f940eb21785f690 SHA-1: c2253a78aacd37e32306df01a2b06124d0311187 SHA-256: bb42cff674e813350d2e2286a1ec62a1e64ac27ab09ee4e32e9175b3dd56e1e2
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of external links, suggesting an attempt to drive traffic to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://sjmhospital.org/files/js/ckfinder/userfiles/files/bifuvugi.pdf In PDF document text
    • http://szerecsen.hu/editor_up/97739484626.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/tizevojume.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/85916088195.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/62910sqrocsl1ju8lc1g8siqsf/lisixekegefuwekoxixufedu.pdfIn PDF document text
    • http://www.serenissimaservizi.com/files/dukit.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/videzuje.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abf43ad431---pedenulosisuwow.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/nowolix.pdfIn PDF document text
    • http://forglory.cz/ckfinder/userfiles/files/nowefewabagedadus.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/176486649.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/wogetaxeboli.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/midudezewo.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/jogafejogutuf.pdfIn PDF document text
    • http://seritour.com/rsm/files/14141210610.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/47314805276.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/wonefidemefi.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/35282048902.pdfIn PDF document text
    • http://spiregene.com/image/files/20210907_153731.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/kenawedonorulew.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/88902095772.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/pilojotezariminoj.pdfIn PDF document text
    • https://ptogel2.com/contents/files/wugukiwipebikudaxoxu.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/67652947700.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=best+malayalam+typing+app+for+androidPDF 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_off0000da98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA98 18588 bytes
SHA-256: 0df66d5aa7842372548d58b7dfce93d631ec0e12aa3082bc6465a282c7401556
font_01_sfnt_off00010ade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F5 11008 bytes
SHA-256: 232864890f47d610dbe8df81a31d7ba3388fa5e4ea1fd1b56c2379461b9eb0aa