Malicious PDF — malware analysis report

Static analysis result for SHA-256 b14ff257e8aa81f4…

MALICIOUS

PDF

66.5 KB Created: 2020-12-16 23:02:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2090c9f51b0ff50d6c6a355db59b0780 SHA-1: 4d43e194a8b1d333a97cd1e5ea74e2060beb2e10 SHA-256: b14ff257e8aa81f4728dc8ce3a5e7c7ac1e2e4526d1251efb3f44f84b6aa9103
96 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier. It contains an embedded URI pointing to 'https://traffset.ru/123?utm_term=the+big+orange+splot+by+daniel+pinkwater', which is a strong indicator of malicious intent, likely for phishing or malware delivery. The document body is heavily obfuscated and unreadable, but the presence of the external URI is sufficient evidence for the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffset.ru/123?utm_term=the+big+orange+splot+by+daniel+pinkwater
    • https://cdn-cms.f-static.net/uploads/4368788/normal_5f91c80f560c6.pdf
    • https://static.s123-cdn-static.com/uploads/4493282/normal_5fcb7b3e7c45f.pdf
    • https://cdn-cms.f-static.net/uploads/4369914/normal_5fba9a03ae678.pdf
    • https://cdn-cms.f-static.net/uploads/4453344/normal_5fa465271012d.pdf
    • https://xixilizuxuwogag.weebly.com/uploads/1/3/4/8/134879277/vifazideguregigabegi.pdf
    • https://lifezubolafa.weebly.com/uploads/1/3/4/7/134715310/xogidisot-norose-wosebarig-jajebo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc64f519955c744b5603647/t/5fcf064414319a51dc281156/1607403077553/joduvilubajegefug.pdf
    • https://s3.amazonaws.com/zafirawit/firmenich_annual_report_2018.pdf
    • https://static1.squarespace.com/static/5fc0ec6c8787e879896c16ae/t/5fc2b867e18c5c478e54f12f/1606596712462/fumekaxaduwokixir.pdf
    • https://uploads.strikinglycdn.com/files/f3f24d87-058c-4952-83a2-58b3374bbbbb/dmg_5e.pdf
    • https://s3.amazonaws.com/tetazino/aminofilina_iv_bula.pdf
    • https://s3.amazonaws.com/dedinavesute/orden_anseriformes_caracteristicas.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_off0000c68f.bin
a92fb9395652e07271e4bbb1c6bc7b55a260478022dca52a04df7b666d269066		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC68F 5568 bytes
font_01_sfnt_off0000d98b.bin
85f2532241fa6bbed2ea33b72103731d3951c39f61fe3cd4ec182a65341f3adf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD98B 10284 bytes

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