Malicious PDF — malware analysis report

Static analysis result for SHA-256 79a5f204a3a74443…

MALICIOUS

PDF

81.3 KB Created: 2021-09-18 11:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 1a839975e5437e3d5eb6a77a5a61b07f SHA-1: 54eef2ccd618e62e8ad70ba0c1acf2d660e3f01a SHA-256: 79a5f204a3a74443a0552d37742758213fe857e33982a47289159d4313cf3ca5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically noted as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The PDF structure and embedded content are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://infrive.ru/uplcv?utm_term=fix+sms+android PDF link annotation
    • http://jafra-com.at/userfiles/file/vesimi.pdfIn PDF document text
    • https://istanajp2.com/contents/files/bugufixokivetogolukulavet.pdfIn PDF document text
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/lisaneb.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/dudulidovuvomevowen.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/rerav.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/pajesokewepobiwodusovadep.pdfIn PDF document text
    • http://rainternacional.com/userfiles/file/leteje.pdfIn PDF document text
    • http://islaminkiel.de/webmisr/uploadwebmisr/file/pumuzuvonikasi.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/vadevafopuralafuku.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/98498922822.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161316b1c5aee6---36091660442.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/32478422174.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/961706534.pdfIn PDF document text
    • http://esistore.com/userfiles/file/gofojavuwugulo.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/75667308054.pdfIn PDF document text
    • http://klaaswester.nl/img/file/vawusurudasupavovet.pdfIn PDF document text
    • http://barefoot.pl/userfiles/file/84463484912.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091308263946.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/441fc13be948109e67aafecd6fbe044b/lesemawetibasefi.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/mipariranisarikigugomater.pdfIn PDF document text
    • https://karjerastests.bankai.lv/ckfinder/userfiles/files/94856445958.pdfIn PDF document text
    • https://motoralbini.it/files/file/57538110925.pdfIn PDF document text
    • https://motecx.com/images/file/jumibanesevekib.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/bemolasemovir.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/muveluwomebejojizogi.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_off0000dc37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC37 10212 bytes
SHA-256: 3bffff9122c23cfa817e5eed3aea2b9d6c5b2a7f640056dce8848d13632ca3d6
font_01_sfnt_off0000f2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F8 17168 bytes
SHA-256: 725b6b0625749bbe3e6af2c4f5e844262558decc9fbb99047e8aeef8ef14e03d
font_02_sfnt_off00011f7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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