Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed06b6cdd7b471f0…

MALICIOUS

PDF

73.5 KB Created: 2021-09-17 19:29:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7ef75ca90b84652b8ad3478267f6e419 SHA-1: b223fc569606ae560ad8f7884bc8406b41663916 SHA-256: ed06b6cdd7b471f0e89fb190858451a547477ac01a16d8de1a82abb1d7fc5a17
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://iburgisidimarsala.eu/userfiles/files/lokogoroxubowupufuwogu.pdf In PDF document text
    • https://arslanemlak.com/E/file/In PDF document text
    • http://4darchitecture.org/img/all/65192841472.pdfIn PDF document text
    • http://stonebreaker.at/25647145656.pdfIn PDF document text
    • http://retrofotr.cz/files/file/88579579422.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/gimifaloguvila.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/89200915178.pdfIn PDF document text
    • https://777mto.net/contents/files/tinasilojexowakopigo.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/fifagemifadesowisagobawe.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/lidom.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/95969498301.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/ziwivixiw.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/bumudaxoparazilawepas.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/0e029318eaf8f46d8195a76106b3b477/tuxezowukexazemudal.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/146094891.pdfIn PDF document text
    • http://nhakhoauytinhaiphong.com/upload/files/sulifikewopudeji.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/popawowetasumumexituf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=competitor+keyword+analysis+toolPDF 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_off0000bcc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D8 16588 bytes
SHA-256: 873adf0cca15949fa8e9c834d44155d0c849c93b1824d292eefed38b4962e538
font_02_sfnt_off0000ff8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8D 10876 bytes
SHA-256: 6fe796cbdbf6645657b4d6f760ba084aa6ec72d1c4be10f14c196f8ad1aef3fe

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