Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5729b0204511cee…

MALICIOUS

PDF

69.3 KB Created: 2021-09-25 17:45:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b86f12525b3ffff35954fd49a63de79a SHA-1: dbc567e7f3f302892aab54ea0a4b49d954b2b18c SHA-256: e5729b0204511cee36489fe2909cbf3bf9bb2248da772f0f54e9c95fb020e6f4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs to execute code or redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links to potentially disposable domains, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via the numerous external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.area-tlc.com/public/ckfinder/userfiles/files/54504725082.pdf In PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/taruzozufoduwapefikofuti.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///lupebamekakaxiwokuz.pdfIn PDF document text
    • http://www.catedralirodahaz.hu/data/editorfile/35078715242.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/resomabel.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/fudalejugomusimofire.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/59961513254.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/wutejaronibeloviguz.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/luzinumaxa.pdfIn PDF document text
    • http://imaginove.eu/data/Files/gusodiniraji.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/mefanamoxa.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/nirozajagapenunoxej.pdfIn PDF document text
    • http://unityproductions.com/upload/files/narokojonamezixu.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/vofanuwatodojisez.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/5961192580.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-23/20210923101711683353.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/zepadupixebarilobepag.pdfIn PDF document text
    • http://koutingchina.com/upload/files/larenagumuraf.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/xosepowuximifatevigixe.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/64524354404.pdfIn PDF document text
    • http://houtackers.nl/userfiles/file/zojivuxumojek.pdfIn PDF document text
    • http://kaie.org/userfiles/file/20210923123550.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/36031623777.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/noluvatatud.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/68001692439.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/sifiti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=is+holmium+a+metal+nonmetal+or+metalloidPDF 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_off0000b0ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0ED 15172 bytes
SHA-256: 1c80f8650040076b0a7400a06a90e518633713bdc51d83e72bb8f6810312d445
font_01_sfnt_off0000d784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD784 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9B 10564 bytes
SHA-256: 7fc317a3841e8f4bf0165afd7bf65f0d4b95ee1753807778c491b7de3114391f