Malicious PDF — malware analysis report

Static analysis result for SHA-256 37c48014a2b112e3…

MALICIOUS

PDF

73.3 KB Created: 2021-06-13 18:32:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dfc2d0f073017bf5ba4c901438dfa50f SHA-1: edf55421687549de5e7ee1b07e6d1dee4e8b5a15 SHA-256: 37c48014a2b112e3506d08dca3dea55177833c150bcc85d460b06ce6fe67a5f7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains an embedded URL that directs users to a suspicious domain, likely for credential harvesting or malware distribution. The document body, though heavily obfuscated, suggests an attempt to appear as an educational resource to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://oniceh.ru/pbw?utm_term=worksheet+on+this+that+these+those+for+class+1
    • https://static.s123-cdn-static.com/uploads/4460230/normal_5fcfe4fbcc991.pdf
    • https://cdn-cms.f-static.net/uploads/4452374/normal_603038a7e3f5e.pdf
    • https://static.s123-cdn-static-d.com/uploads/4492257/normal_60b007370d609.pdf
    • https://static.s123-cdn-static.com/uploads/4492871/normal_5fee1c7050e8e.pdf
    • https://cdn-cms.f-static.net/uploads/4493245/normal_605144d3381c2.pdf
    • https://cdn-cms.f-static.net/uploads/4476758/normal_600c3feb580b5.pdf
    • https://cdn-cms.f-static.net/uploads/4484623/normal_605f714898345.pdf
    • https://static.s123-cdn-static.com/uploads/4393515/normal_5fe4fb4314ed4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/71ee26f8-2337-4107-89d6-56b3e6377494/kevibiwolapadiwabisejif.pdf
    • https://uploads.strikinglycdn.com/files/3e9660aa-2785-4da7-9f32-fda267f15eeb/lowrance_elite_4_hdi_installation_manual.pdf
    • https://uploads.strikinglycdn.com/files/da890c78-03c2-4b5d-be25-98370ab4067d/logic_pro_x_macbook.pdf
    • https://uploads.strikinglycdn.com/files/34eb4878-63d3-435f-99ef-22ede24a35be/how_much_is_the_first_edition_harry_potter_books_worth.pdf
    • http://niwomif.pbworks.com/w/file/fetch/144667284/mezimararamejimut.pdf
    • https://uploads.strikinglycdn.com/files/c981c436-360f-4166-bec6-b6acaebb2f05/27010010660.pdf
    • https://uploads.strikinglycdn.com/files/060cfcad-f2c0-4464-aba1-4272821495aa/memepenuditisow.pdf
    • http://zubipuwaf.pbworks.com/w/file/fetch/144839364/fugotipakodar.pdf
    • https://uploads.strikinglycdn.com/files/cc585335-5669-4ee7-a71d-be761c890125/46927863731.pdf
    • https://uploads.strikinglycdn.com/files/3292b7a5-5146-4111-bf95-82fa3179bdc7/fobipitoxelo.pdf
    • https://uploads.strikinglycdn.com/files/a5c17a6c-9da4-4288-9dfe-06e0bdfda9f6/zimesakamibosegusidisa.pdf
    • http://zupelapowi.pbworks.com/f/mozilla_firefox_latest_version_67_download_2019.pdf
    • https://uploads.strikinglycdn.com/files/3350be14-9294-490e-9bc0-75eda045fa90/qu_hace_el_corticoide_en_el_cuerpo.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_off0000e1e2.bin
4f0532329340e0f85b804fe7e399e2e1fe2a6738aacfa2d22af045fd28e5320d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E2 5096 bytes
font_01_sfnt_off0000f34a.bin
db49eeb02f6ddd4bc99f247edece18d357576f55da6af810f2f022d65ef3be7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF34A 10792 bytes

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