Malicious PDF — malware analysis report

Static analysis result for SHA-256 d147e96a0855df71…

MALICIOUS

PDF

71.9 KB Created: 2021-10-04 01:46:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a7c0d55762cbcbccc86a26958ed7424d SHA-1: 38e44e01292ea1ed4fd669fd81010131c82f8a56 SHA-256: d147e96a0855df713dcaa12f38fdc95c336f8af12d0077436542be300af09489
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The PDF contains numerous links to external sites, with one heuristic specifically identifying it as a link farm on disposable hosting. This suggests the PDF's primary purpose is to redirect users to potentially malicious websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://mtcongnghiepxanh.com/upload/fckimagesfile/55315921514.pdf In PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/75425663871.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/50897446887.pdfIn PDF document text
    • https://solturism.ro/images/file/fulada.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/13915056857.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/5985368584.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/momikenujixevujub.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/rewon.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/24018729399.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/kigifijemenerizu.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/kavapefog.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/61540f48681dc.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/64002723043.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/nuzebikazazavop.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/zasadunorug.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/lofegivud.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/rogimekanidi.pdfIn PDF document text
    • https://1000families.eu/userfiles/file/95385559243.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f0f7f97b85---vufulikus.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/ladumalelururavokutagono.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210902_4E03B8732CE66CA6.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/39377977800.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210927011800.pdfIn PDF document text
    • http://sro52.ru/uploads/files/3231358969.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144fa324285f---1339932132.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=vocabulary+for+competitive+examsPDF 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_off0000b467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB467 11028 bytes
SHA-256: 5b25c266e14c9a2513db8e3c08dc80f12eaff7c246d3badac385ad117a960f57
font_01_sfnt_off0000cdf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE609 17008 bytes
SHA-256: 356af23cd746a8aca6f61a909a2c1fe8a90192760b5244ca498010b36f2e6625