Malicious PDF — malware analysis report

Static analysis result for SHA-256 4185e51e9efe8974…

MALICIOUS

PDF

85.4 KB Created: 2021-03-19 22:24:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7bbf2e1426a16ab1504d150a10326f16 SHA-1: 73acb8581736b0b103372474034b33597e9a8dad SHA-256: 4185e51e9efe89748a7d47c89274c02354e5bebc3de5448f386974942a884e36
136 Risk Score

Malware Insights

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

The PDF document contains a lure related to configuring Aruba PEC email on Android, directing the user to a suspicious URL. Heuristics indicate the PDF is malicious and potentially a phishing or trojan delivery mechanism. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=configurazione+posta+aruba+pec+su+android
    • https://cdn-cms.f-static.net/uploads/4370528/normal_603be5ac37014.pdf
    • https://molemopiwe.weebly.com/uploads/1/3/1/8/131856052/sexometitukimurewu.pdf
    • https://cdn-cms.f-static.net/uploads/4426073/normal_60294474de8f9.pdf
    • http://sozaxesugoj.mywebcommunity.org/13148805287.pdf
    • https://cdn-cms.f-static.net/uploads/4393188/normal_602905fe440b8.pdf
    • https://cdn-cms.f-static.net/uploads/4383792/normal_6042ca17f046e.pdf
    • https://kodidenub.weebly.com/uploads/1/3/4/3/134328035/3093204.pdf
    • http://lilozekakotelup.sportsontheweb.net/why_is_my_printer_power_light_flashing.pdf
    • https://cdn-cms.f-static.net/uploads/4481408/normal_6034c297785b6.pdf
    • http://jimubezisu.iblogger.org/describing_words_worksheets_for_grade_2.pdf
    • https://cdn-cms.f-static.net/uploads/4421611/normal_5fe9d14f7307f.pdf
    • https://static.s123-cdn-static.com/uploads/4404103/normal_5fe40dbc6f222.pdf
    • https://fukaxoxatu.weebly.com/uploads/1/3/1/4/131438517/pawiwusufuzifeju.pdf
    • http://tugokutuli.scienceontheweb.net/langston_hughes_birthday_poem.pdf
    • https://cdn-cms.f-static.net/uploads/4490739/normal_600c6df7d79d1.pdf
    • https://nipoxumafoji.weebly.com/uploads/1/3/4/7/134717148/4a385.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://aaf2f8d8-4593-4070-95c3-ed2308805076.filesusr.com/ugd/337eea_f00e3ee7def84369b4cc74a23473db4f.pdf?index=true
    • https://5c71d6b4-13b5-43a2-97a4-9a0eba4d0f4d.filesusr.com/ugd/0f1814_ab18eca26cec420d88992807d1df6c93.pdf?index=true
    • https://0e9c393c-9feb-4465-ae9d-4486bea7a644.filesusr.com/ugd/4b68be_b3c0810f34f8448a8eaccc1487cc0d2c.pdf?index=true
    • http://zawanotatunum.rf.gd/ipu_b_tech_cse_syllabus.pdf
    • https://a2fe464c-28d1-4db8-bb2d-552ad9bc2f4d.filesusr.com/ugd/941bb1_1139ee19d7cb4f64a2aa87ffbcac37e7.pdf?index=true
    • http://fugovolit.rf.gd/12993737936.pdf
    • http://sifepati.epizy.com/70393279414.pdf
    • http://selofedibaxonal.epizy.com/pupazaxotuvu.pdf
    • https://7ffe38df-ef78-47a1-8632-a9c579db478a.filesusr.com/ugd/8ff694_589aa6fa73d04735add4c7ae05b8c44c.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_off00010898.bin
77495f1b349ec1d3da1bae44a7bb31e1879735aef72fa9c8e0c88f3c629cb4b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10898 5384 bytes
font_01_sfnt_off00011afb.bin
976f5321c2850a6139950b4997438664dfcd07509cc1123518742e1479bbd8b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFB 13452 bytes

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