Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eb3eb19ecb050f0…

MALICIOUS

PDF

82.1 KB Created: 2021-09-11 15:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6f3fa09d7f56e7fd0047deb1431cf2cf SHA-1: 183305b907ecbceb3afa5917f9c2a82740aeef02 SHA-256: 9eb3eb19ecb050f0a8859389d531abbb332eecac72df106178e167698a5877d5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are likely part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. While no scripts were extracted, the overall structure and URL distribution suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pustelnik-budownictwo.pl/ckfinder/userfiles/files/mufufumor.pdf In PDF document text
    • http://pivotal-technologies.com/userfiles/file/vesoganakag.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/12683138285.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/folonidexebulapijuge.pdfIn PDF document text
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/rugotixizonunodemitobopo.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210907101425.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/90638533619.pdfIn PDF document text
    • http://space-edge.com/upload/files/dupawusu.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/53266190904.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/patunuke.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/jusudibovog.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/41458083493.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/96986136228.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/b11c36340f0049be16851964a5c7752b/livet.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/verubadowolukepexox.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1214dfc14---83423803448.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/93038494026.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/28935731563.pdfIn PDF document text
    • https://sealskinz.ru/files/file/73688612510.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/sorajo.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/jaloj.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/39937203368.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=types+of+system+softwarePDF 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_off0000df09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF720 10440 bytes
SHA-256: a378f946246ef258836a1679bce47b4a0d585328b73962c3f2f3334a0325b75d
font_02_sfnt_off00010ef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF6 16992 bytes
SHA-256: 69033d1de118b66d750f748226a845f230bb32344d0d5a9d7d7f4e3c422393cf

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