Malicious PDF — malware analysis report

Static analysis result for SHA-256 bca4110a39b2df73…

MALICIOUS

PDF

79.0 KB Created: 2021-09-11 23:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7089c9b4547a504a43b5168e81cf2c11 SHA-1: 77ef437724168eada703c765994dbaff5e7244d0 SHA-256: bca4110a39b2df73be42d1e18c122990887d5922e33a9bdf2b0e4a697c6571dd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The PDF structure and embedded content suggest it's designed to redirect users to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://wickedcheesy.com/images/file/taxodabijatafusad.pdf In PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/d4f8b7649e396a0e8cdcc2e25b6881c4/33065027285.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/kuzawolosib.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/folomon.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/xumamavomozuxatage.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/jikopevexuvisaj.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/55479790681.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/morukabezi.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec31750fd5---jelifut.pdfIn PDF document text
    • http://www.abcklima.hu/data/editorfile/pitud.pdfIn PDF document text
    • http://hausdergesundheit.net/userfiles/files/pedepomin.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/gisamolumonub.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/jamifixepodilijazifafu.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/65904023067.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/rejed.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/zajofelafuzasan.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210903021553.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/54202212721.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc95f450e0---fozejep.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/20509153744.pdfIn PDF document text
    • https://stw-nowogard.pl/download/file/sowijexerojide.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/98703878060.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=android+11+screen+recorder+settingsPDF 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_off0000d48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48C 16576 bytes
SHA-256: 9c4e206f2c401d1fa16606fba1ab937cabe16a55acd53a961c1a2b35e6d0d426
font_01_sfnt_off0000ff75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF75 10372 bytes
SHA-256: 23b9d8cca0b8694df6af9d659ba4560e5ff489b6ff438c3c378d67440a19de4b
font_02_sfnt_off000116e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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