Malicious PDF — malware analysis report

Static analysis result for SHA-256 3da90f99b5dd954f…

MALICIOUS

PDF

80.8 KB Created: 2021-09-17 13:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 479029e196ee06f214672c93ecc5ab79 SHA-1: 27f51ff0e5afdf958463925b36191cb559334a66 SHA-256: 3da90f99b5dd954f5d59e5bfb543ae52542936442aad555c7b5d9f4cf1521bb8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged as malicious by ML classifiers and ClamAV. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The document also features a high number of external URIs, many pointing to potentially disposable hosting, indicating a link farm or phishing attempt. The presence of embedded JavaScript suggests an attempt to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://chulintemple.house-well.com/CKEdit/upload/files/xifolemuzowaji.pdf In PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/rubodapofix.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613076c182400---57649557790.pdfIn PDF document text
    • http://e-district.org/userfiles/file/lutabe.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/13488433191.pdfIn PDF document text
    • https://probidjp.com/ckfinder/userfiles/files/20210901_202147.pdfIn PDF document text
    • http://rrmkaryacollege.org/rrmkarya/userfiles/file/37855486903.pdfIn PDF document text
    • http://www.satunatc.ac.th/ckfinder/userfiles/files/durizovapuxulobigujakezag.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/95883914377.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/25131258070.pdfIn PDF document text
    • https://signika.pl/Upload/file/fotapeginuxopigefezini.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/rolapofef.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613da3dd421cd---86580607380.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/3293249797.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/vikuvi.pdfIn PDF document text
    • http://wjcopy.com/upload/files/kigenogel.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/31201800242.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210914_1225388FDC00A128.pdfIn PDF document text
    • https://ms01bet.com/contents/files/48776561205.pdfIn PDF document text
    • http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/49473963352.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/ratagofodaz.pdfIn PDF document text
    • http://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/40229784420.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=ganool+movie+websitePDF 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_off0000d923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD923 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13A 10500 bytes
SHA-256: 04240dab052e221c4feb35ad19c6286a543447a5188de2b0c6a1866f8977f797
font_02_sfnt_off00010934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10934 17428 bytes
SHA-256: bdce80438d24d689979f0c71bafd21546aaa0f24790b2df75c1697313f735f22

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