Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e92db1e9be8db98…

MALICIOUS

PDF

85.9 KB Created: 2021-10-07 02:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 75477c28ff6079002f4b04f8d2eb3935 SHA-1: 6cfc31c8468fc35283299386f595003c564e0e76 SHA-256: 2e92db1e9be8db987238399b2185b5511b66b8fedc9b8c86d347230a527465b7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable hosting and using UTM parameters, strongly suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=compare+and+contrast+newton+and+einstein PDF link annotation
    • http://grossbuch.com/upload/file/lepezemufutepufoputise.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/9898393659.pdfIn PDF document text
    • https://computerzone.pk/file/99638933262.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/wekonerumevale.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/49386856978.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/14355682748.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1615a86cab3230---xojevize.pdfIn PDF document text
    • https://gulamanis.com/contents/files/gofelunafule.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/63526029053.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/sinunufuxikarulawita.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/tujun.pdfIn PDF document text
    • http://hpcad.pl/Upload/file/69867417921.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/1012762179.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/69795064613.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/87157935395.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/55882842102.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/35633095492.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/wejawinemulaboj.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/64824244556.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/24128848865.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/62412f52d285e94d6b13ab7277dc5754/14638073184.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/jojabalezubif.pdfIn PDF document text
    • 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_off0000e342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE342 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB59 10748 bytes
SHA-256: 0ea6604c23f970b340b87ce62c88c463a20dccf2b08129c0874e59f643fcd024
font_02_sfnt_off0001141f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141F 20204 bytes
SHA-256: dbe92ee975fb76bfe90c97fed4dd31638e351cd16fccb6e66a712438ebe0967e

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