Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfdd8b57a17c9081…

MALICIOUS

PDF

79.0 KB Created: 2021-09-28 00:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1aabc3d709b22ad64426a45aa8918c15 SHA-1: 6d1ba5a9f9a8800738b80189c10d91fe27ca3fa5 SHA-256: dfdd8b57a17c90810700780b8d438baff60a6c6eeced25498c1de3f6bbe9849f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for delivering malicious payloads or redirecting users to malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded JavaScript is expected to download and execute a second-stage payload from one of the listed URLs.

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
  • 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 http://omeofest.eu/userfiles/files/deramogedozafebi.pdf In PDF document text
    • https://pharma-tools.pl/galeria/file/muzekikakiludegefidi.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/jitiwotaje.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/xixadifejososugeluwiz.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/tuxarofemogeledorenevaxod.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/zejetovaboru.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/donemub.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/xugarod.pdfIn PDF document text
    • https://kimcert.net/E/file/81329365404.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/menivobodotinosidubemuw.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/81028490556.pdfIn PDF document text
    • http://jodhpurheritagewalk.com/images/file/84911937998.pdfIn PDF document text
    • http://dlzj.net/upload/files/2021092805053920874.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/mixubilowitexez.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210921/0142545614.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/ropajufujidizapupepajivew.pdfIn PDF document text
    • http://forspeed.cz/ckfinder/userfiles/files/20566889976.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/74685197082.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/54582112200.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/movufozujufaludopemu.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131bbdc47606---63433510624.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/danarumujatusamofokob.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109031852025485.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=integracion+por+sustitucion+trigonometrica+pdfPDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/97320494123.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_off0000c7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E1 10968 bytes
SHA-256: 1e6e1cafd56061b54e0ba4fe90265ca68b960647d25e15540986878ae48a1df6
font_01_sfnt_off0000e126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE126 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF938 20272 bytes
SHA-256: d10c6df29ac0c4903194afacecb9bb0b764267ba855623cfa3e9364a50c559b1