Malicious PDF — malware analysis report

Static analysis result for SHA-256 8de38278a731cdcc…

MALICIOUS

PDF

80.8 KB Created: 2021-09-20 17:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 376c5d210eedb56cdda37b6b39b422ba SHA-1: 8a299ead7ce96b255b2d62a27fd987641f03f303 SHA-256: 8de38278a731cdcc6150880219b87846ada56e3d96ca27dac157a4efc2aadf05
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV and an ML classifier as malicious. It contains numerous external URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The PDF structure and embedded URIs suggest it is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://drafthe.ru/uplcv?utm_term=oggy+voice+changer+app PDF link annotation
    • http://srs-budapest.hu/uploads/files/tumazenulokiboti.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/jebebopowejufexiwen.pdfIn PDF document text
    • https://soudurelausiere.com/upload/editor/file/pizaloforawuligusomu.pdfIn PDF document text
    • http://perksys.com/userfiles/file/mivepixabevatugisav.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/xawaniguxedijinezawad.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/zabomabadikonotumavepejo.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300d474529a---zijibuxetelega.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/vipowabikirifo.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/zawisojexosokojevumereba.pdfIn PDF document text
    • https://0900107678.com/upload/file/wesasepovikenaburese.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/48812243273.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/wurajeruvarixopituvivutun.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/93996819894.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/sorutusova.pdfIn PDF document text
    • http://dakov.hu/_user/file/pipuliridi.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/29667648509.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/serugevodebuni.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/39348964425.pdfIn PDF document text
    • https://dafelia.com/files/62879887449.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/popixosebimesivoga.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/rowuj.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/72213423209.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/84464791204.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_off0000d852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD852 17640 bytes
SHA-256: 2520b695f8ae32159166fa9dd4a8dfe6aa6b0857d673a2e2f133be0197be8353
font_01_sfnt_off00010594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10594 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAB 10544 bytes
SHA-256: f5c99b959ee67931511789f1fa9f400bd67175d49c6e76223332f292358d710d

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