Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b272ccc4a5d2a04…

MALICIOUS

PDF

71.9 KB Created: 2021-10-02 18:32:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0e2ea1ad073d72b12b7f8455dfd39662 SHA-1: efc9dd606cc35977308eeec418a1f13f42aa22cd SHA-256: 6b272ccc4a5d2a045ccab8e59f30a4969520558b60d47be923415dbbf17049a8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and the numerous unknown URLs suggest a phishing or content-farming scheme, where the JavaScript likely redirects the user to one of these external sites. ClamAV also detected this as Pdf.Phishing.Trojan.

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://commune-bourre.com/userfiles/file/88409341203.pdf In PDF document text
    • http://thaoduoconline.com/userfiles/image/file/ruxobiviwarativ.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210915140832.pdfIn PDF document text
    • http://metallpress.info/files/73435033028.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/35871862226.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/59248326740.pdfIn PDF document text
    • http://emaaravm.net/upload/files/54974432428.pdfIn PDF document text
    • http://gabident.pl/local/userfiles/file/wanewobolisowesokugu.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109300817562942.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/89893118015.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/tokuvisojip.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/29160203529.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/tigemanibep.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/14059959129.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149f6beeff9d---23583797676.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/69746477334.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/33951554184.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/lozikugux.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/wimusalopuritezat.pdfIn PDF document text
    • http://worshipedia.net/sites/default/files/file/romesi.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/40673510542.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/3603824494.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/logaxasatipewunebazali.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/6135d8a7a7b4f.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/17540596207.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=written+sources+of+historyPDF 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_off0000b720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB720 10432 bytes
SHA-256: f3e25a4bc305a390924d9ea461ec996c2688700383eb716f043fcaac0f44c459
font_01_sfnt_off0000ceca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCECA 17052 bytes
SHA-256: 717084817600907898932e64a68f3f3b0a6ee08de171174fd664cd9dbcbe1997
font_02_sfnt_off0000f9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1