Malicious PDF — malware analysis report

Static analysis result for SHA-256 897814df2c18161d…

MALICIOUS

PDF

87.2 KB Created: 2021-09-15 23:19:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9eb7753d1e363b7a25c128f8efc69ad7 SHA-1: 1559b7515a6c1d36d1990ebaf539ac11041f7d13 SHA-256: 897814df2c18161ddcf46f0d1174d93edc220c8f9ec91158d8780adf447b0c64
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links that point to a link farm, a common tactic for distributing malicious content or conducting phishing. 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 potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://khmim.com/ckfinder/userfiles/files/xoxawudi.pdf In PDF document text
    • http://terremeraude.com/userfiles/file/tirotodurulifagopebogudav.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/87612582671.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210901072845.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f233f24a31---39234656310.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/tofogunu.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/giwuxijedaz.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/labasesazumakolitowineg.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/jonevivanivotatiwewilig.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/49836296747.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/gitariwufexo.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/38518346380.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/84948217075.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/kururupopi.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/tozuzifanufezitoralavuvo.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/54961206656.pdfIn PDF document text
    • https://ykitraders.com/UserFiles/file/73132975060.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/80254648512.pdfIn PDF document text
    • https://aitalk.vn/upload/files/61705197483.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/kipuloxu.pdfIn PDF document text
    • https://o-dance.com/upload/files/rifotazegepofin.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/a5ef6da7381ae57ae437cae22c9812df/59838655293.pdfIn PDF document text
    • https://emartdeko.pl/galeria/file/durazabisax.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-6/20210906065802814674.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=vob+dateien+auf+android+abspielenPDF 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_off0000ee53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE53 19284 bytes
SHA-256: 901678265344161bf8f0d25a8956a9deec8f79fa305e1b5097ec925364f6c190
font_01_sfnt_off00011e7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7A 10700 bytes
SHA-256: a6f2cb8e0e58ff9bc11a8f84d2e04aec215f1a4e2e3f6e0364900f1ad0b27788
font_02_sfnt_off000136f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1