Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eaada48962a73b4…

MALICIOUS

PDF

79.2 KB Created: 2021-03-14 06:32:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6080ed4d93b3c70dd489fb6345b912d3 SHA-1: 764c90af0cf99aa95c74ae78c83417aacbe6de04 SHA-256: 3eaada48962a73b4a2b4fdc45233995cbca7430f28a950755e36031b7c3a55ae
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, a technique often used for SEO link farms or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or trojan distribution. The embedded URLs suggest an attempt to drive traffic to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/award?keyword=probability+tree+diagram+notes+pdf
    • https://jamekefexufi.weebly.com/uploads/1/3/4/8/134866820/f7f9bda41e345.pdf
    • https://gutasoleniv.weebly.com/uploads/1/3/4/4/134481560/c9d7206.pdf
    • http://nizumewuminal.iblogger.org/arnold_schoenberg_books.pdf
    • https://gebiralegesexi.weebly.com/uploads/1/3/0/8/130814020/6799124.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kizugokofo/kadexigodasenaponevebolum.pdf
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_0ce05307ebe342a4942442b32e68266e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/34972533-10c3-4ee1-b1ae-4d4ad95b42c6/lafuzeronexuzopegarojisuw.pdf
    • http://ribitotuv.epizy.com/57034194617.pdf
    • https://d54d55f4-8004-4613-9f19-7b96cbed0ae7.filesusr.com/ugd/ce4b32_c6e1f051d455445781ea545a3645251d.pdf?index=true
    • https://aa5f33e9-793b-4807-a257-9eac84d314d0.filesusr.com/ugd/aa57b2_7b6f56a6c6a14003a56883a2662b296d.pdf?index=true
    • https://0503187d-52cd-4237-9521-a3cb9bf551ae.filesusr.com/ugd/5bb01c_5f40e74169774806895ba6863ecbee52.pdf?index=true
    • https://s3.amazonaws.com/tonemakopinibem/google_sheets_business_budget_template.pdf
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_64f3509931b24f33a76d3a0884d10952.pdf?index=true
    • https://4c5ad993-366d-4b3a-aa99-9b6f56583180.filesusr.com/ugd/01e791_846650a3549b432ca4e073f2cbd2e620.pdf?index=true
    • http://fixedarutagovun.rf.gd/bokisolinogilutuja.pdf
    • https://s3.amazonaws.com/roware/white_christmas_sheet_music_and_lyrics.pdf
    • https://aca292c6-a3ee-4c96-b4c9-db15c8eca1b9.filesusr.com/ugd/cd1d52_8ba9f716d0a24990a5039a533b06f373.pdf?index=true
    • https://104e3d6a-8609-4a5f-ba89-88df40aeb326.filesusr.com/ugd/3cb22f_9ea4f8bcd8f34bb19c32299d344778f6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/834a002e-1d11-4e36-8b4d-63f457cccd43/new_yorker_crossword_app.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_off0000f16b.bin
c0f5eb6e7dd40fce1c5a9850a851b4784a462438233dbe899e3015461b898528		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF16B 5604 bytes
font_01_sfnt_off00010466.bin
25d35fb1ab90e728d120a9d52dcef4093d172a90a89a19c1f84ec9717ae3b984		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10466 12136 bytes

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