Malicious PDF — malware analysis report

Static analysis result for SHA-256 4087b8be8f0ebc97…

MALICIOUS

PDF

85.5 KB Created: 2021-09-07 05:18:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7e8c9c1762527d2c48f984d2ec8ea994 SHA-1: b3a0d049d8c1b63a2ad8050c967f0acab781895a SHA-256: 4087b8be8f0ebc973027b9545f0b5ab1dc7bf1656beeced0247a4dd8bab2288a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of embedded URLs pointing to various domains, suggesting a link farm or phishing campaign. The presence of these numerous external links indicates an attempt to redirect the user to potentially harmful websites.

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://ketchas.ru/uplcv?utm_term=division+worksheets+year+3%2F4 PDF link annotation
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/819ookf37lg72047shaqfgsl43/kijad.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/78569128593.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/63146298710.pdfIn PDF document text
    • http://jcpingie.be/public/files/48848103544.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/bowomuzobisarakomon.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609898845296d---7214783677.pdfIn PDF document text
    • http://africareview.in/userfiles/file/nonasejasiralopowureje.pdfIn PDF document text
    • https://hssanesteban.cl/files/12385131558.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/14143938232.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/jorugexanusowimib.pdfIn PDF document text
    • http://china-miyaco.com/img/file/2021622164852.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/72463041448.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/36078190757.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/98864730932.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/wamavutatuvanaxawirizer.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/10598884955.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/15523933607.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/mitamexegiwojosowaxaxinu.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/5924313731.pdfIn PDF document text
    • https://grouptm2.com/contents//files/36212508996.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/bebasabexeposopeloxokafij.pdfIn PDF document text
    • https://eclearusa.com/images/file/pojopugidaf.pdfIn PDF document text
    • http://modern-pro.ru/files/file/lojisinovapisevubepojum.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_off0000e7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F3 18404 bytes
SHA-256: af24dfa01749210d2e012f98c4825b4be47176a0bbcb02b7207ec29a30f982ed
font_01_sfnt_off0001173f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F56 10800 bytes
SHA-256: 60eeba8a5ac33da2f977f26e8da7d454fdc694f999294cc6c0d04c45b800b383

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