Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b233b7fc5c4a68…

MALICIOUS

PDF

96.5 KB Created: 2021-09-09 06:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0b167041cf4f73b67d96874340e2f46b SHA-1: 4d848d654a258f95b1f75df01b8bdb70f6e30998 SHA-256: 88b233b7fc5c4a68126fcc3d343518b8ff0346af3be15f65ced9fd5f6fd0a9dd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are flagged as link farms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://laborke.ru/uplcv?utm_term=creature+3d+full+movie PDF link annotation
    • http://sinhorelli.com/userfiles/file/wefofot.pdfIn PDF document text
    • http://infinity-c-t.com/userfiles/file/zesone.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/gidavemoginumokimafidas.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/4288212850.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/m77k20mkrnvbcnsdnd8gnk0jec/vogadosu.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/31096213709.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/mowasabotosowin.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/xukofavivuk.pdfIn PDF document text
    • http://toonesk.com/upload/xemevigodoji.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/29006541980.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/28437872734.pdfIn PDF document text
    • https://ventadeterrenosagricolas.com/userfiles/file/fupafuxi.pdfIn PDF document text
    • https://polandpools.com/contents/files/bijinibiwesijivuvaviwe.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/lituvo.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/16878185337.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/tamofuzu.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/jozevuravima.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/novubedazanuwemuwaduvarar.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/79223136731.pdfIn PDF document text
    • https://aneri12.eu/res/file/soven.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/39517439995.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/53475445538.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/f629f25732bb3d985a521b6e7db2b83f/vuzumajuxemige.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/4424228804.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_off00011487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11487 18348 bytes
SHA-256: 10ccfc78222f328d0c5900d65d006f384063868014e11e87dd26cc09e14db099
font_01_sfnt_off0001441f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1441F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015c36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C36 10612 bytes
SHA-256: 891c3184e47944690ae6bb25d903e92222b1aabab97ad220a043d5457482774b

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