Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7a11a4ae37734ff…

MALICIOUS

PDF

80.7 KB Created: 2021-09-13 13:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e23bfd967d11c1a3cf764ad179ba66ff SHA-1: 89b03934a198f9dd0815d50f0b05c0c7ef1ba96c SHA-256: c7a11a4ae37734ffabb732cc6874c43e79ff776d4fbf4022f7f81b5118bc10c0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external URIs, flagged by ClamAV as Pdf.Phishing.Trojan. The ML classifier also strongly indicated maliciousness. The embedded JavaScript and external links suggest an attempt to redirect the user to malicious websites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=big+mansion+in+bloxburg PDF link annotation
    • http://yuanhebiotech.com/upload/files/novawutowabugezus.pdfIn PDF document text
    • https://kaparatt.com/images/File/98395074634.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/safafizekit.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/bilopuperevezejegazujuro.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/6588355870.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/72355880952.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20210912215630_1040286181.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/dopozatupusemuxodosibuwa.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/50993049462.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/2980434898.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/65331670791.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/8709650059.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/49463751576.pdfIn PDF document text
    • https://kstraders.com/userfiles/file/sogunaleferivikuziv.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/8b192b0cefbf0f57294db27bbaf08927/56598080331.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/82548792223.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/50789252379.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/nepidazagobizuruxowepi.pdfIn PDF document text
    • http://uniondrygoods.com/fckeditor/userfiles/file/xaluxatubekerovesojil.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/78645161418.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/lomuvabatizojaxiwanu.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613158bd92054---31851389004.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/jojivuji.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/81451517700.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_off0000d63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63B 10616 bytes
SHA-256: 4f51ae8b508afbc4bfc143091a22e2570349c361a995820beb473feadd78220c
font_01_sfnt_off0000ee7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7F 18060 bytes
SHA-256: 5e076d022c5adef2d5cc1fade84a14106fb5a5450c3297e41d590b414e046f57
font_02_sfnt_off00011d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1