Malicious PDF — malware analysis report

Static analysis result for SHA-256 acef1eaee1165ae5…

MALICIOUS

PDF

81.0 KB Created: 2021-09-10 21:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8f2c6eec92995922090e572ba55efd2b SHA-1: 836aa93855631258d416d717b0c4ce32e14f76e4 SHA-256: acef1eaee1165ae5c276887e12d9bab7c25c08e2cec8fe8c48345e9a4fc7c5b8
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of the 'SE_PASSWORD_ARCHIVE_LURE' heuristic strongly suggests the document's purpose is to trick the user into downloading a password-protected archive, likely containing a secondary payload. While no scripts were explicitly extracted, the document's structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://carbontuning.ru/file/kowexavojobi.pdf In PDF document text
    • http://mfcpavpos.ru/file/vamizetaw.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/9134934416.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130abd0b21da---6681485647.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/36209045461337f4ccf96e.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/magas.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/71517520432.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/47375216087.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/dufatiwoxowadetulimiv.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/radodiguwo.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/ropufuvorin.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/sejavukijine.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/jopiwikot.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/gudelimegeduro.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/kenepojarujoni.pdfIn PDF document text
    • https://msvadba.ru/files/file/feparotetenabisojurozidi.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/jimoraf.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/61690416412.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/86939268191.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/wogokixowidagobetipuko.pdfIn PDF document text
    • https://salonrewards.ca/images/file/galaxuniladimawofujazudoj.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/c15ntdo0lt3eckmoo5uh9chro2/62912549646.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/90680288223.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-6/20210906185310766764.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/zusiluvutofomo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+open+phone+in+pcPDF link annotation
    • 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_off0000d886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD886 18460 bytes
SHA-256: 9cb6f2acbd28798cb9d4e110569011a9f35a923cc3473a138db44655e4c049c6
font_01_sfnt_off000107dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DC 10072 bytes
SHA-256: 4e2f55468a6a7bc26bffc2a0909469b4c187b1050d301b523b24c23d47b513b0
font_02_sfnt_off00011e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1