Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbea3b7427a8ce7a…

MALICIOUS

PDF

79.1 KB Created: 2021-04-06 07:31:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb28de920c9c1d6235af2d2755f97f43 SHA-1: ce306e46835d7735f75428b1f15db047f97c1acb SHA-256: cbea3b7427a8ce7a03d9f32140f2f53f63d7848acde6a4e5e4b92a0a4a83f18b
196 Risk Score

Malware Insights

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

The PDF document contains a high number of external links, many pointing to PDF files on Weebly and other platforms, suggesting a link farm or redirection mechanism. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content likely prompts the user to install software, a common phishing or malware delivery tactic. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or trojan delivery vehicle.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 https://kuzutuzo.ru/123?utm_term=avast++gratis+italiano+windows+7
    • https://tirotulesi.weebly.com/uploads/1/3/4/8/134849952/rojuruwowonipu-vumavitexetejo-teropo.pdf
    • https://vulesavub.weebly.com/uploads/1/3/6/0/136095957/zokuretotezira.pdf
    • https://cdn-cms.f-static.net/uploads/4379970/normal_60665a1c72eb7.pdf
    • http://nawilojobate.iblogger.org/jamuluwewawapivudaxul.pdf
    • https://tanifovekula.weebly.com/uploads/1/3/1/3/131379991/favotesedowoki_mawafuwevata_mujapuru_wusoxomibe.pdf
    • https://cdn-cms.f-static.net/uploads/4405194/normal_60375052bac95.pdf
    • https://cdn-cms.f-static.net/uploads/4486548/normal_5fdc50b958cae.pdf
    • https://cdn-cms.f-static.net/uploads/4385852/normal_600c89ab49e80.pdf
    • https://cdn-cms.f-static.net/uploads/4411501/normal_606bca00159f4.pdf
    • https://soxoxalumowaju.weebly.com/uploads/1/3/4/7/134768556/fixawonulofuxo-fevex.pdf
    • https://cdn-cms.f-static.net/uploads/4485693/normal_600efbd00effc.pdf
    • https://cdn-cms.f-static.net/uploads/4372983/normal_603ed01e89333.pdf
    • https://cdn-cms.f-static.net/uploads/4450632/normal_6032471961226.pdf
    • http://mapebudo.getenjoyment.net/24412842079.pdf
    • http://bogipeborowe.sportsontheweb.net/openwrt_tl-wr841n_v14.1.pdf
    • https://cdn-cms.f-static.net/uploads/4450514/normal_60342afa01ba3.pdf
    • https://jegobagugixados.weebly.com/uploads/1/3/4/8/134858953/vuwipupitikodu-sigiduno-kudujub-sivowediben.pdf
    • https://cdn-cms.f-static.net/uploads/4450418/normal_605a05f4009db.pdf
    • http://baxosemot.iblogger.org/18859233535.pdf
    • https://static.s123-cdn-static.com/uploads/4451231/normal_5fe4c1e139bb0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sufixis.myartsonline.com/lorawerunupod.pdf
    • http://kagiwabiluwotel.epizy.com/can_we_e_aadhar_without_otp.pdf
    • http://sujosivetobifir.epizy.com/mudaritavefilejuzi.pdf
    • http://noserupoxor.rf.gd/reduce_file_size_macbook.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f979.bin
c100e6dec3ce685049177c61e3fe2f985641bda0a0a7c640ff4f3b237bc25d7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF979 5212 bytes
font_01_sfnt_off00010b61.bin
9453f5a95058a46e3fb8f220c98e5a2a7054aeb44587b820b9b7f3cadaeb5bdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B61 10824 bytes

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