Malicious PDF — malware analysis report

Static analysis result for SHA-256 d862eaf9d668de24…

MALICIOUS

PDF

75.3 KB Created: 2021-09-25 17:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3f0ce7a4fd812320a36fd04149d600d3 SHA-1: a45e95c5b2d50fcd9816f0473fafc82b5696b51e SHA-256: d862eaf9d668de2492b05e39eac4ff41a390d9e7bae07dec121df3c4fda110e4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a phishing or malware distribution attempt. The document body is heavily obfuscated, but the embedded URLs suggest a lure for software downloads, likely leading to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=soccer+manager+2020+apk+download PDF link annotation
    • https://inprovitbolivia.com/ckfinder/userfiles/files/11019936473.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/34318882800.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/4333935686.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/19245965442.pdfIn PDF document text
    • https://baoholaodong24.baohohoanglong.com/userfiles/file/pefigifogokerafekudewe.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/1788714282.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/1042414184.pdfIn PDF document text
    • http://ckudzcssffhhj.handysociality.com/upload/files/xesanavugiposujozuj.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/togesewulazapimipejor.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/86938237421.pdfIn PDF document text
    • https://rinducm1.com/contents/files/jaluv.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/moninibitupoxozifuvolo.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/muwulirol.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/zovip.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/8977137963.pdfIn PDF document text
    • https://baongochoa.com/upload/file/557555482.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/87035456867.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jimopu.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/lawobenarizokimanatubu.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/c5ef0ea4c2f491f44eb5790a716d90c6/jukiwanedeg.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109021518097807.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/2118852464.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/bomowavubarunugudojida.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_off0000bc56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC56 10996 bytes
SHA-256: 2abfe1bfa763d51512d422774c09182a4e92682609e92f536ff4bdf1964fc921
font_01_sfnt_off0000d5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCC 18912 bytes
SHA-256: b24808d3765a1b271ab9b6644d163865417f3e38d365f68d3bc92469bb1ec002