Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0d2c0ed4451cd9d…

MALICIOUS

PDF

75.8 KB Created: 2021-09-14 09:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 18f1373fb6f8a8d5a77b4a9d4b14fe1d SHA-1: e3b9c206d94c07d32b229f2cf01394346dd84cad SHA-256: b0d2c0ed4451cd9d5cd2717a661fe1522402afda53e88b7fcae5f522a9a2c6f2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier assigned a high probability of maliciousness. The PDF contains numerous external URIs, many pointing to domains hosting other PDF files, indicating a link farm or redirection mechanism. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM suggests a deliberate effort to obscure the final destination, likely a phishing or malware site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://savitaco.com/uploads/images/files/nomexedo.pdf In PDF document text
    • http://ingegneriarossi.it/userfiles/files/93030249385.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/76062208236.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/78816590014.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/71975640863.pdfIn PDF document text
    • http://pk-rowery.pl/user_pict/file/51956265714.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/venoxipewoduja.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/91782537679.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/17581492400.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/91044295253.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/veduwarog.pdfIn PDF document text
    • https://bunexim.dascalita.ro/app/webroot/files/userfiles/files/rubotefevekevobirebowag.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/fodofudegexiko.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/20147979609.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/lilup.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/rurezigokefozoremerosugo.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109060723443554.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/29453565467.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/42377132474.pdfIn PDF document text
    • http://sofar-france.com/userfiles/file/xiridavow.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d068c06757---75815257334.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/52127216441.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/dabomejadog.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/21970085140.pdfIn PDF document text
    • http://dolonchem.com/upload/files/76811799694.pdfIn PDF document text
    • http://fullx.net/files/2246367740.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=what+is+the+ip+address+on+my+phonePDF 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_off0000c721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC721 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF38 10720 bytes
SHA-256: 8df0f59a49aa974f2a46a174835da69b4b30a02b60476e71aacfdfd1a960684d
font_02_sfnt_off0000f7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AF 16164 bytes
SHA-256: 83a89a4a316d7810f17856523a10dd8802b887c9a6adcbc807c5da8ffdc9c025