Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7cc77f8b436c02a…

MALICIOUS

PDF

73.0 KB Created: 2021-09-14 13:23:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 79f7857da776faf6a576f7a4e7e9d0f6 SHA-1: 9bec9c236bc7b272a7615f50a8589e1c82e1fe15 SHA-256: a7cc77f8b436c02aea4a4c2e66ef87203aa3880758cb16a07744d8965eed31bd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content, likely leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://catamma.ru/uplcv?utm_term=shutter+island+watch+online PDF link annotation
    • http://mecaniquekd.ca/upload/file/55806069651.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/zubimidiwigobifet.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/4758416993.pdfIn PDF document text
    • https://wonkingchina.com/d/files/16003548160.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/lovusewubo.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/papiminuti.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139536b5422a---23178526629.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/gefijoporavedevumogid.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16131f507b9665---posowudepevaduwulibiv.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210901060512_1wna5t.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dee7a5c637---56851195219.pdfIn PDF document text
    • http://slsnn.ru/content/files/59951401358.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/joledovizel.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/kokenizukomawugijikofil.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/88354076884.pdfIn PDF document text
    • http://www.culturehousesun.org/photos/file/kufizovej.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/74540387498.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/gakiladokonetumawa.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/91814582448.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/dewopemezelepizokif.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/viwajebobejaf.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/98294602849.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/gofufezijadipomiwagi.pdfIn PDF document text
    • https://31app.com/userfiles/file/litobuliso.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_off0000bc68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC68 16256 bytes
SHA-256: a424cd3a4f879b1d9056b7ab97db11607cc869e8b28bb5e63e271f8badca4d2f
font_01_sfnt_off0000e604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE604 10728 bytes
SHA-256: 205481e211df0720c3d30d4611888f956613f85d697bcc7bfc8e400c1e24f009
font_02_sfnt_off0000fea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1