Malicious PDF — malware analysis report

Static analysis result for SHA-256 8866e389de62eb87…

MALICIOUS

PDF

82.7 KB Created: 2021-04-06 00:38:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ced5009051da80bfc7b348fa8b6f6d5f SHA-1: 13a8f1796ae044ae6fba6320b4c164ca59226b52 SHA-256: 8866e389de62eb876babac872152f7d284063dcdd12b345088948a2c1d0c7359
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that leads to a domain associated with malicious activity, likely intended to deliver a secondary payload or phish for credentials. The document body, though heavily obfuscated, suggests a lure related to 'trigonometric identities exercises'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dafemum.ru/wix?keyword=identidades+trigonometricas+pdf+ejercicios+resueltos
    • https://cdn-cms.f-static.net/uploads/4402280/normal_6045029b406a0.pdf
    • https://static.s123-cdn-static.com/uploads/4408335/normal_5ffa9d808f882.pdf
    • https://cdn-cms.f-static.net/uploads/4417815/normal_603bc78fce720.pdf
    • http://vawabipoxe.sportsontheweb.net/download_teks_asmaul_husna.pdf
    • https://cdn-cms.f-static.net/uploads/4504554/normal_602254b5491e5.pdf
    • https://cdn-cms.f-static.net/uploads/4401985/normal_603ee6c799c26.pdf
    • http://bewudewumit.sportsontheweb.net/83008350143.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/d22c0149-ac69-4f2b-b71f-f308b9a35182/17549822477.pdf
    • https://uploads.strikinglycdn.com/files/6d215c7f-223e-428b-9f07-51b7e19cc4b8/dawugosavedixifak.pdf
    • https://uploads.strikinglycdn.com/files/9e842a64-2608-4919-9656-ce3e11f3e95e/76082280557.pdf
    • https://uploads.strikinglycdn.com/files/3f31349a-525e-420b-9eec-57acb4d973fa/nova_video_questions_hunting_the_elements_answer_key.pdf
    • https://633ee4a5-ef7f-4c35-8c02-ac6c60bc6361.filesusr.com/ugd/0ab374_e7fb843375a24f77a7ed69f08693c4ca.pdf?index=true
    • https://uploads.strikinglycdn.com/files/babf1ce5-06d4-4d1b-a148-32c8482fd6e0/bituxifofafejesorinejus.pdf
    • https://0e01c86c-6ad9-43de-bc04-b8819f410213.filesusr.com/ugd/73c254_e12b40abe3454ee79411ff2b07a734fd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/222e4e44-0399-4dc5-94a4-6b5a03b0f7a0/diccionario_espaol_online_definiciones.pdf
    • https://c2c662fa-00ac-4c69-bf5d-04da7d6c99e2.filesusr.com/ugd/9b33c5_dc8293c6a500419797bf1996fb08ab66.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1826e2c4-0a63-4edb-bc26-1c597c9ed2be/black_and_decker_grass_hog_parts.pdf
    • https://8d67285a-e3c5-4820-bb1a-bb91ce1079a6.filesusr.com/ugd/d54300_f8847e90f76241299c6676e4e4f58885.pdf?index=true
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea64.bin
e071e73966eacb5b477f3809774916abf98e5bfe8bda20989721cce8c9e55483		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA64 1716 bytes
font_01_sfnt_off0000f2e2.bin
081fc39d745113b65f038a0e820722f9c2fe6e854415632ae18908ae0e790042		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E2 5372 bytes
font_02_sfnt_off0001050b.bin
9791726b8e12d2d222d0a151e42cb46613af6edaec44d8555be0b286d470dc40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1050B 12484 bytes
font_03_sfnt_off00012d02.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D02 4324 bytes

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