Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a45ec8b4f1e2bf9…

MALICIOUS

PDF

81.8 KB Created: 2021-09-14 18:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e7329dbded8a679e217165e5cb239b9e SHA-1: 1f77e1c4553a84ff89384e3ee2671aedff843b09 SHA-256: 4a45ec8b4f1e2bf9689a5ac5fd067b8f99bf7d0f54c92b455b778900b9a4dbe2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://drxzhang.com/userfiles/file/tomaxunoju.pdf In PDF document text
    • http://morard-mcf.fr/data/Files/fopowudaguxoxonelolixiras.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/vabep.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/dezorotodaxe.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/letewivujawimazewal.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/18761028317.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/161328d1a33c4a---mevusamenudufagunemasiz.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/gejor.pdfIn PDF document text
    • https://kueapem.com/contents/files/65725296552.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/52693248055.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d31778c2da---solowezimafurawadem.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/48551503968.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210914_084921_162.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/sudageduxenemawoxogunixak.pdfIn PDF document text
    • https://moulindelarroque.com/userfiles/file/91355870885.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/webexufuwan.pdfIn PDF document text
    • http://www.motocams.cz/ckfinder/userfiles/files/lijegoxufuzuz.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/sojewogenanusigutoninelaf.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/bipobifibimazitegajurat.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/gonefizezubazivodop.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/mipop.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/peloxemosilavevux.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/sozifatideri.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/rowobekukaxalafimiga.pdfIn PDF document text
    • https://agatanorek.com/files/file/samomiw.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/37466714257.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=groovepad+beat+makerPDF 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_off0000d4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF8 10480 bytes
SHA-256: 36d305392a6e187bba2ca2c7ce889f68336d241a00e05279c05b3f09beed21d8
font_02_sfnt_off00010499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10499 20080 bytes
SHA-256: 401c6638d921f341a99f28f83f8ecd8c30cda2c25e59583dccb719de48e5398f