Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc8d365d1b18acf8…

MALICIOUS

PDF

89.6 KB Created: 2021-09-12 03:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 89305f618ed951160a0889ab7b8fce7d SHA-1: e3f2d4cb51a549275d0c9f0ba4f2602f6b75a5e0 SHA-256: cc8d365d1b18acf8504a6c2f871d761d2049a5f092114ec1febbaf3237f874f6
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and the link farm nature suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://tjjjsh.com/uploads/files/sibojovaduwibu.pdf In PDF document text
    • http://divapharma.com/uploaded/file/40728129494.pdfIn PDF document text
    • https://moulindelarroque.com/userfiles/file/leziluwazajukewemutab.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/febosepipukuzunimajebakur.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/51257887572.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/1519199723.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210906181543.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9bbc525f7---liduz.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/boludikuporenoxig.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/rasudazubiwifarirefiseni.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109091351106502.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/14214581526.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/93472456365.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210907232505.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/luzofofuvawaxudisafibux.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/wakezavebodinutolab.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/161366bd8d8e55---52342274707.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/19669660271.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dumudeloxubanojixinibuvun.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/68631285291.pdfIn PDF document text
    • http://hangquangauto.com/files/14577307619.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/bolibatujakago.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/4838118722.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=pedro+paramo+pdf+completoPDF 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_off0000f669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF669 19584 bytes
SHA-256: 55bf04006b439ee474d3b04152ba272cca8017d68302b3108c3a4fda5eacf76f
font_01_sfnt_off000128fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FD 10420 bytes
SHA-256: d5adb4c84c2ea84dc65b540d7ad1d8ed3205f1297b91aea9ad8e20195eec3b93
font_02_sfnt_off000140a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1