Malicious PDF — malware analysis report

Static analysis result for SHA-256 275979e683513ad2…

MALICIOUS

PDF

77.5 KB Created: 2021-04-02 23:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e7d4f2b85d7f2c5e6d83fba4601b1ce0 SHA-1: 94104fa8e1aff8d18fc20660b2a98990b8ee9606 SHA-256: 275979e683513ad2d604f7f39a938ff3b5c571e8c5a9d5b073b8a3cb27123679
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 pointing to 'soxebez.ru', which is likely used to host a malicious payload or redirect to a phishing site. The document body, though heavily obfuscated, contains text related to 'wkhtmltopdf' and a date, suggesting it might be a crafted lure.

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://soxebez.ru/strik?utm_term=what+is+two+phase+method PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387715/normal_60221a56ee50b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408875/normal_6061c59c30454.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473035/normal_606543a580680.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379615/normal_605568b83df08.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426087/normal_6004073e4a253.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370062/normal_5ff9abae74fed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487665/normal_604ce2ed49512.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500183/normal_5ff7f3cb49c4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383170/normal_605863a98cf97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380230/normal_603c17f21fdbc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454673/normal_5fe310ed99ed4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://19527f6f-7821-4b33-8e58-d909ab9a203f.filesusr.com/ugd/b18fc6_822ecb7f4e824985b00020150741ff1c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e16d2da8-c76c-49cb-a8e7-6f2333825c23/65973439600.pdfIn PDF document text
    • https://7d14b3fe-44ab-47f5-a5a4-fb5d7998febd.filesusr.com/ugd/ba499c_58bb65d513b5468f8eb0801102d7f426.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/44cfaab4-4c64-4294-a211-cbcfd7fb48bd/aca_12_step_workbook.pdfIn PDF document text
    • https://5a060084-92f5-4e09-b02e-bbac8bb45871.filesusr.com/ugd/05c943_5aa132189f08425da7eefe81c59999a2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/93a5899b-dbcf-463c-9e52-fcc90001057b/is_luffy_the_most_powerful_pirate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/665c0e8d-9ada-48d5-8754-51e58597eee1/armstrong_ultra_sx_90_furnace_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fae1b972-954b-4d52-9ec6-574843ac36a4/4942355319.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b72339eb-02c5-44a0-a53c-16a3b94fda0e/what_is_chinese_folklore_religion.pdfIn PDF document text
    • https://6558ac43-984d-4e3a-97a1-dec8860611ed.filesusr.com/ugd/c73740_38a04004ab034c939b0758ebe17d2541.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BA 5176 bytes
SHA-256: 05c85cf162fd72d80dec8cc95d3e2682351b8c555934de4aa9f38046b97f5fab
font_01_sfnt_off00010448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10448 10676 bytes
SHA-256: b9109619fd8c9c34f4015c1ac6f18f67f34190ced7dc6ff3b2b952bcda461f78

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