Malicious PDF — malware analysis report

Static analysis result for SHA-256 8da9ab2dd668f4d7…

MALICIOUS

PDF

80.1 KB Created: 2021-09-21 16:56:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b89d636ebd346fdd3664de848f6b0be8 SHA-1: 3b1acec4b19333177d6ecbd293f5185866f02e51 SHA-256: 8da9ab2dd668f4d7aadb592b388617ec9759c696ff932697b03b8243884ff5e9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript and a large number of external URIs, many of which are linked to link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript (T1059.007) is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=windows+activator+loader+7 PDF link annotation
    • http://farmina.ru/uploads/files/todozedolezaxedalev.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/69221078778.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/vonunuwibovejolasoxi.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/11864401033.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/jogoxele.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/75543808314.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/29558442294.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139fd4255bbf---17336478219.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/33669248214.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614270457bba1---zovutozagiluviluj.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/94003823378.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/rilixusuw.pdfIn PDF document text
    • http://vikohasanfiber.com/upload/files/vijozubed.pdfIn PDF document text
    • https://horgaszvelem.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/94708755305.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/jajekojosajizeselekoxun.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/90544100473.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/watowinamowatogilexam.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/50488219881.pdfIn PDF document text
    • https://gibidesign.com/fckfiles/file/99257499621.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/rebugusupezakujupalebelef.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/dupezafamixefitaxe.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_off0000d355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD355 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6C 10556 bytes
SHA-256: 760d548f0b5893ee70398a2b04a0b48124584e97c137bdee47a2d27f47a1ae1a
font_02_sfnt_off000103be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BE 18536 bytes
SHA-256: cc6f767dae9d1469f7e6ecd275a7da5298d743c5524d7444676cb9d81ab51916

Open this report in the interactive analyzer, or submit your own file for analysis.