Malicious PDF — malware analysis report

Static analysis result for SHA-256 e408d2e54395df73…

MALICIOUS

PDF

73.3 KB Created: 2021-09-24 02:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d671defd5230f47941e168501a1a8cb6 SHA-1: d0aca792d777bc753d4dabd4167056757af0f69d SHA-256: e408d2e54395df731ed0fa0e506aecf7c84179e6685f04a34b40fb526cdfb38d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://noelex22.org/userfiles/file/zadezepaj.pdf In PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/xawimonefiki.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/27562733233.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/regala.pdfIn PDF document text
    • http://www.centrosanmarco.eu/img/news/files/69364625818.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/sosovajiduvezagurawige.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210921152941_890885537.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/vetovisawamanopogo.pdfIn PDF document text
    • http://hanahana.vn/media/ftp/file/34361825948.pdfIn PDF document text
    • http://buonoantonio.it/userfiles/file/33145217205.pdfIn PDF document text
    • https://scalper.ir/data/files/file/85597974147.pdfIn PDF document text
    • https://jung-yeunjang.ch/userfiles/file/61451707527.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/44298144769.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/natokarojugemobulefez.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/77029225746.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/ruriloresowurovizi.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/53691024561.pdfIn PDF document text
    • https://salwangurugram.com/files/buzelowiropixaniponizalo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f7579c563---86363751655.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109231631371110.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210919_0E6EE1500BBDD18F.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/94224634113.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161371dfce35d6---58339460803.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109211048287516.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/lutakuxiru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=mathematical+physics+satya+prakash+ebook+downloadPDF 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_off0000b70c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB70C 17860 bytes
SHA-256: 355851a0eee5f1846c3e5f127e8d44bc6c46822daf4e7e0e56cf9cf7135edd4c
font_01_sfnt_off0000e572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE572 11204 bytes
SHA-256: e9b465503f6583717c46cca0bb0e2cf36c8d28bee69b623c156c291a7b9f697d
font_02_sfnt_off0000ff5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1