Malicious PDF — malware analysis report

Static analysis result for SHA-256 86cd24431bf3f59a…

MALICIOUS

PDF

88.7 KB Created: 2021-09-09 03:06:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 343a4e0371ce3a03dd311de5c995a813 SHA-1: e4273d513989d6207f4b69c6253b36f9b27cbda3 SHA-256: 86cd24431bf3f59af70cd5b9466a58d504d1d4f52a085916d749cda38c7d830c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://mirsistem.com/depo/sayfaresim/file/66271955614.pdf In PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/zezebodaviwisupivotedi.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/bafulazelufudam.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///fikisisagetujatir.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fde3df7f3---45553092768.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/koxerebekofa.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/karixoj.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/poguxuzanuvosuzagak.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/10061017395.pdfIn PDF document text
    • http://kco.su/userfiles/file/gikorogosigumile.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/90473060545.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/doxabaxodenifizolijorodu.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/57423146183.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/13757152596.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/96240216245.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/dediluvixugi.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132b9ebe3e1e---50686056421.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/81732974069.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/11610933396.pdfIn PDF document text
    • http://annabarons.lv/files/files/nigufuzanevojupexawisux.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/xejimadogonetuka.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/20830447547.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+use+your+phone+camera+as+webcamPDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/78503353951.pdfIn PDF document text
    • 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_off0000f38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38C 10932 bytes
SHA-256: ec8ab8eb1b4f0e1a7d8e833d5510e2db64dae9587c9e7c16d3ab014b4e95e1fe
font_01_sfnt_off00010c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A5 18448 bytes
SHA-256: 7891b26687ff1e39db63ad879eb6f44e4a30044ef83e52315dd51a543d4e03e2

Open this report in the interactive analyzer, or submit your own file for analysis.