Malicious PDF — malware analysis report

Static analysis result for SHA-256 de3c063718944d80…

MALICIOUS

PDF

82.1 KB Created: 2021-09-09 07:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: b9147503e80e67b5e55976e26dd8ccf8 SHA-1: b6afdb0d37ad16e5a60c6ce9c8902edd33974cec SHA-256: de3c063718944d80ef04bca5316d1d6c69240d92db1cb513592cd60e56bd1f8f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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=types+of+xml+parsing+in+android PDF link annotation
    • http://naturallabs.fr/userfiles/file/57248690037.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/61873114689.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/2003454317.pdfIn PDF document text
    • http://landpas.pl/upload/file/kibiluwuvanujarukuxik.pdfIn PDF document text
    • http://gdgom.com/upload/file/210903153116551855akbtwnrns69x.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/gsn6it1sr872bl2e0ajdq1df16/kakigulezu.pdfIn PDF document text
    • https://shidoremicrosys.com/media/24407293221.pdfIn PDF document text
    • http://samtekelektrik.com/files/60536524766.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/29144354871.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/5246959473.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/21664200814.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/75979701991.pdfIn PDF document text
    • http://exosushi.com/uploads/files/modaf.pdfIn PDF document text
    • http://sinsg.com/files/fckeditor/file/60987800112.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/wisividejapo.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/4ffd8eb96855256943931e1d03664268/61500216939.pdfIn PDF document text
    • https://drlanda.hu/user/file/12737023620.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/4854220441.pdfIn PDF document text
    • https://somos.co/dleyes/admin/fotos/file/gexakuposidag.pdfIn PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/pamozejazi.pdfIn PDF document text
    • https://norservis.com/files/files/murobisuwux.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/jezugalidudixudefevobuk.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/gixerukoxovetukilosumeno.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-3/20210903000528970986.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/papakuki.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_off0000d8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F3 18400 bytes
SHA-256: bdfc47ba04b4c4b64af7aba0f9823902cc3b019ba332ca71ea0dc8643a137c41
font_02_sfnt_off00012190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12190 10924 bytes
SHA-256: e7f3625c3699d11075895b3c25a832ddc218170a4a52c92c483193d911c03a35