Malicious PDF — malware analysis report

Static analysis result for SHA-256 e51870144d43a1b9…

MALICIOUS

PDF

83.0 KB Created: 2021-02-27 03:20:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 6ee7cefb33d0657c18bb25f4ca4c22de SHA-1: 14e398e8b52e51646c088300d9b9d92474836a0f SHA-256: e51870144d43a1b992af47e993061ff521185f8cf8ec330255a29e9f0c34671a
146 Risk Score

Malware Insights

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

The PDF contains malformed streams and numerous external URIs, indicating malicious intent. The ML classifier and ClamAV detection strongly suggest this is a phishing or trojan delivery mechanism. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect the user to malicious content, likely for credential harvesting or further malware deployment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://kuzutuzo.ru/award?keyword=mr+coffee+12+cup+coffee+maker+metallic+red PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4365602/normal_5fed05eb663ee.pdfIn PDF document text
    • https://tavepokivosexox.weebly.com/uploads/1/3/4/6/134656262/becdab63dbe7d48.pdfIn PDF document text
    • http://vujereki.22web.org/autocad_trial_version_2018.pdfIn PDF document text
    • http://bullbananavannaone.xyz/513066131772ia67.pdfIn PDF document text
    • http://beruvutekimeged.22web.org/18323386691.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393908/normal_602b652f535ad.pdfIn PDF document text
    • http://alex-chekalev.com/3d_java_games_360x640hu55x.pdfIn PDF document text
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/mezubexen-zefipined-sunibe-xategolavi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479906/normal_5ff0e8d4e8866.pdfIn PDF document text
    • http://comp-arenda.site/mandatos_formales_worksheet_answersgqsig.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501042/normal_5ffb51042146c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://numodonodepo.epizy.com/fanuxizarajudopanikom.pdfIn PDF document text
    • http://dokelegusipodi.epizy.com/wows_gaede_guide.pdfIn PDF document text
    • http://gezexibubaju.rf.gd/navien_tankless_water_heater_error_code_10.pdfIn PDF document text
    • http://riduxipilitaj.epizy.com/mantoloking_bridge_crabbing_report.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/bizoxuxubi.pdfIn PDF document text
    • http://xidafod.rf.gd/imphal_airport_weather_report.pdfIn PDF document text
    • https://s3.amazonaws.com/sefepugolupalax/can_co-trustees_act_independently.pdfIn PDF document text
    • https://s3.amazonaws.com/xelimewat/dujozanagopijijedo.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000faaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAA 5152 bytes
SHA-256: f705bcddba3c59362733593b601502a57c22bc19a94ec08ddc397e1715dafe99
font_01_sfnt_off00010c41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C41 10476 bytes
SHA-256: c3da2707cad8eb944712ef96ceeb142db853e402a301e13748647a93a2d91e7c
font_02_sfnt_off00013011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13011 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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