Malicious PDF — malware analysis report

Static analysis result for SHA-256 d01513165fdb3fec…

MALICIOUS

PDF

75.8 KB Created: 2021-04-08 08:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4815f4559d6ca0dfbecbac72a8e883f9 SHA-1: 9c85bc923bf2c40140769a09a1f1ef0768b81c1d SHA-256: d01513165fdb3fec595fae420b6ad45ebcab33549c80b2ca176a8ba6c54d83c1
96 Risk Score

Malware Insights

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

The file is a PDF containing an embedded URL that points to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The document body, though heavily obfuscated, suggests a lure related to verb tense exercises. The presence of an external URI and the ML classifier's high confidence indicate a malicious intent, likely to redirect the user to a phishing site or download further malicious content.

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://dafemum.ru/123?utm_term=simple+tenses+of+verbs+exercises+with+answers
    • https://static.s123-cdn-static.com/uploads/4421354/normal_5fe5c5bbb0b9b.pdf
    • https://rumefonurotu.weebly.com/uploads/1/3/0/7/130740232/6e86d293dd.pdf
    • http://damodudajipofem.22web.org/56006463856.pdf
    • https://cdn-cms.f-static.net/uploads/4459628/normal_603fab840464a.pdf
    • https://gafonubizaragu.weebly.com/uploads/1/3/5/3/135346264/kidawesuzajotuvupo.pdf
    • http://suziterunedoloj.sportsontheweb.net/neurobiology_of_psychiatric_disorders.pdf
    • https://kexanitafax.weebly.com/uploads/1/3/0/8/130813084/49d5afe07.pdf
    • https://vigusukababimer.weebly.com/uploads/1/3/4/8/134881512/5457895.pdf
    • http://gatowixipeba.mywebcommunity.org/zegipilokikiv.pdf
    • https://cdn-cms.f-static.net/uploads/4445877/normal_602460d9ba725.pdf
    • https://cdn-cms.f-static.net/uploads/4476567/normal_6066f454193d1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lafagelupuf.myartsonline.com/pairing_yurbuds_wireless_headphones.pdf
    • http://vasedazixi.rf.gd/raspberry_pi_4_64_bit_debian.pdf
    • http://bizedesaxifu.onlinewebshop.net/ralupelagak.pdf
    • https://645c32c3-7e99-4959-b93b-7980205539d7.filesusr.com/ugd/30a31c_433acbe6a65b4e118b258dda7710fdb2.pdf?index=true
    • http://tijuvewoduga.onlinewebshop.net/amie_exam_form.pdf
    • https://uploads.strikinglycdn.com/files/cacd7c9e-f341-47f0-906a-03ebc379f3c5/orpheus_and_eurydice_opera_arias.pdf
    • https://uploads.strikinglycdn.com/files/8ee35f69-4636-463f-8945-3fab79f73ec7/noxasexakenorilat.pdf
    • http://bapujuta.epizy.com/mobixotawurevadosajeziman.pdf
    • https://uploads.strikinglycdn.com/files/f7fe0f40-1c6d-4c51-9aba-a3778deac5ef/freak_the_mighty_book_and_movie_similarities.pdf
    • https://54179944-c6a3-49b3-9462-5d1939b6aff2.filesusr.com/ugd/49f5ef_73fa71dbe2034e67964430a9367cd6f4.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea80.bin
247606c926a17a41a404d5d737c337ee5d57faffb756522339b3b047635ddc95		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA80 5716 bytes
font_01_sfnt_off0000fddc.bin
01058eb0dceddd04e6dd5ee6a70aed7744e07b514c98d1abcb40d1fc051673de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDC 10476 bytes

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