Malicious PDF — malware analysis report

Static analysis result for SHA-256 becba410010b9bfa…

MALICIOUS

PDF

84.8 KB Created: 2021-09-12 22:08:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a5cf986bc99f281d6a4f68aaf6a1bc78 SHA-1: 1179e85dd056fc886963ad4a24bfd96fc9def002 SHA-256: becba410010b9bfab717684d48fa2cdd7f520c85fbb18dbf4993b5f6047a633e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern involving directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://georgewongdesign.com/gwd/upload/files/zetuxukodiguva.pdf In PDF document text
    • http://lnyuanzong.com/uploads/files/20210905154513.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/96857136010.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/87051503731.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/82776064135.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/zekasasidodonub.pdfIn PDF document text
    • http://dautuck.com/uploads/userfiles/file/jakabexewoxu.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/951aa05e399f72877af3e0acd68d8021/simit.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/fawupixak.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/mumulekukakipuvubij.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109090636313645.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/zolado.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210912_A4E83CECEFD5320E.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/53775235937.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/51865803249.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109041657317627.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe1387ae48---bufutepugixixujomegodav.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog/file/42728871951.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95003246887.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/85837942358.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/buzezubimazamof.pdfIn PDF document text
    • https://frisch.ro/files/file/21268369786.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/97229919654.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/suwipefojovolaxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=redmi+note+8+pro+price+hong+kongPDF 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_off0000e106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE106 10928 bytes
SHA-256: 4f9c3746aab792fc58493dbdca5745e932b151e7dfa315e7ab1cd7a956381fe1
font_01_sfnt_off0000f9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11203 19444 bytes
SHA-256: 71ab4149e6fec5007de085448595dcec5eafb0ecc303479696bef6a701253849