Malicious PDF — malware analysis report

Static analysis result for SHA-256 e034bc041aecfbce…

MALICIOUS

PDF

75.8 KB Created: 2021-03-29 20:20:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4473d537e50109ee4eb493a446ff0277 SHA-1: 8f8a8b8bbf232c91195046f32e0bf53a39ea269e SHA-256: e034bc041aecfbceb4dedfc251310acec702a7af3b574f88fd5444168e0b8026
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, and is flagged by multiple heuristics and a machine learning classifier as malicious. The ClamAV detection indicates it is a phishing trojan. The embedded URLs likely serve as a distribution mechanism for malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://ponafet.ru/123?utm_term=bilingual+and+multilingual+education+pdf
    • https://cdn-cms.f-static.net/uploads/4451350/normal_6022e08f5fa83.pdf
    • https://static.s123-cdn-static.com/uploads/4464874/normal_5ff231eb9aa54.pdf
    • https://cdn-cms.f-static.net/uploads/4403804/normal_60170cc2dcee0.pdf
    • https://valezofijamope.weebly.com/uploads/1/3/4/4/134445284/4932039.pdf
    • https://static.s123-cdn-static.com/uploads/4444117/normal_5ff4d6b6a2a69.pdf
    • https://static.s123-cdn-static.com/uploads/4446388/normal_5ff6921061cc4.pdf
    • https://cdn-cms.f-static.net/uploads/4405638/normal_603aff3e1af9b.pdf
    • https://static.s123-cdn-static.com/uploads/4494668/normal_5ff1ce8bca1b6.pdf
    • https://static.s123-cdn-static.com/uploads/4473049/normal_5fe089426bb6b.pdf
    • https://cdn-cms.f-static.net/uploads/4474734/normal_60445ede98eec.pdf
    • https://static.s123-cdn-static.com/uploads/4427811/normal_5fc7e7eda85d9.pdf
    • https://bazifimu.weebly.com/uploads/1/3/4/6/134661545/xunirudewa.pdf
    • https://static.s123-cdn-static.com/uploads/4379043/normal_5fdee3bf57a40.pdf
    • https://cdn-cms.f-static.net/uploads/4421048/normal_605c1636b9233.pdf
    • https://cdn-cms.f-static.net/uploads/4385213/normal_601f59e17a202.pdf
    • https://cdn-cms.f-static.net/uploads/4481280/normal_605cd9754b1b7.pdf
    • https://static.s123-cdn-static.com/uploads/4493578/normal_5fff321185878.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gowebabuxogiro/free_5th_grade_vocabulary_worksheets.pdf
    • https://s3.amazonaws.com/dubiditiginowo/aprendizajes_clave_segundo_grado_primaria_para_descargar.pdf
    • https://s3.amazonaws.com/zarusegibitumet/charlie_parker_billie_s_bounce_sheet_music.pdf
    • https://s3.amazonaws.com/tesodagiwor/sacred_geometry_patterns_in_nature.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_off0000ebd6.bin
03082599cb81d7c7ceb6f296de576fcb2540b18ea303454ef61239987760d244		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD6 5252 bytes
font_01_sfnt_off0000fdad.bin
710d50d2c600e2c872e7c7d15b6e2a364739858b4afb81d0a98b02dd7547fd86		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAD 10440 bytes

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