Malicious PDF — malware analysis report

Static analysis result for SHA-256 c112b5eadd5fd597…

MALICIOUS

PDF

87.8 KB Created: 2021-09-16 02:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8b7b6a63ed6bfe18c233689808ea7076 SHA-1: 3a9eb27c56e1ac7f64681d9765053d72319ec806 SHA-256: c112b5eadd5fd597c806eb8df1f750d72ff52b327500e7cf7eeca331320122c6
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially malicious sites. The presence of 'LOLBin token sequence in document text' further supports the malicious nature, likely involving command execution or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://medvor.ru/uplcv?utm_term=the+best+app+for+call+recording PDF link annotation
    • http://royalrep.com/userfiles/files/9103363897.pdfIn PDF document text
    • http://axwelindia.com/uploads/91176130265.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/kafekogirureba.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/4i7tbftov11vb4u72g45ob65g2/31311844995.pdfIn PDF document text
    • https://msiutilities.net/documents/60555049476.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/tufotadelawizog.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109112238147137.pdfIn PDF document text
    • https://mandaljeebanking.in/ckfinder/userfiles/files/naperowodovuwavijikaku.pdfIn PDF document text
    • https://moulindelarroque.com/userfiles/file/nudufefasuma.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/47432862807.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/493919105.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/18920274904.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16135074a3f40e---dadiwi.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/lakawawilipeputiruran.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/bekepofegodobofojiju.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/71641475328.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/bejegeramogadux.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/vufedilat.pdfIn macro / runtime command snippet
    • https://ljlconst.com/admin/images/file/xumerogexajanipegemafapum.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/29487932837.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/12443743088.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/4564131903.pdfIn PDF document text
    • https://marosme.ro/hirek/file/3641597580.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/genulagobujabagavutafekuf.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8lIn macro / runtime command snippet
    • 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_off0000f0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F7 11000 bytes
SHA-256: 76600e8158c20376e33a25d33cab272fc2f15fd2533bfb863ced6fbfb653870a
font_02_sfnt_off00012206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12206 18736 bytes
SHA-256: 16c9b620d3fd68dba6f6763fc58748ba2b9278f10c6cc53e9a29803f99db41e5