Malicious PDF — malware analysis report

Static analysis result for SHA-256 651f7e94be2d277e…

MALICIOUS

PDF

71.3 KB Created: 2021-02-10 14:44:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 84c88738b189e340fb7966b6800f8e21 SHA-1: 6a2a4b9756dc943d1531e1f79901cf8c75291c98 SHA-256: 651f7e94be2d277ee9539a81c122113a7674b0e0488625618bed738f76ffbab5
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, a technique often used in link farms or phishing campaigns to direct users to malicious sites. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. While no scripts were explicitly extracted, the presence of numerous external links suggests an attempt to redirect users, likely for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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/123?utm_term=chevy+cobalt+manual+shift+knob+removal PDF link annotation
    • http://smotrikino.fun/insensibility_wilfred_owenog9pa.pdfIn PDF document text
    • http://feyakast.online/81958658156x5djr.pdfIn PDF document text
    • http://storeplus.pro/black_christmas_1974_full_movie_youtubev56f1.pdfIn PDF document text
    • http://labiluwewinedu.22web.org/texas_boat_ed_test_answers.pdfIn PDF document text
    • http://lewuvajenajen.iblogger.org/xesosisusesivawako.pdfIn PDF document text
    • http://peregukejipesa.iblogger.org/roxaveranafikuzatoxu.pdfIn PDF document text
    • https://wiguvebilef.weebly.com/uploads/1/3/5/3/135389097/ab244997af63.pdfIn PDF document text
    • http://scoretdho.best/converting_fractions_to_percents_worksheet947aj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fobajoruvibu.epizy.com/police_report_search_california.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/three_phase_auto_transformer_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/85554309380.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/decimalformat_2_decimal_places.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/wofigarufolokel.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/adobe_reader_for_pc_apk.pdfIn PDF document text
    • http://mifisabewup.epizy.com/bot_js_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/birthday_video_background_music.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F0 5392 bytes
SHA-256: 0a3c6538ebe499a4c1d68c266b0d6b3fa6c2e8ce62ee1ebbf458d41da75ecda0
font_01_sfnt_off0000ec28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC28 10416 bytes
SHA-256: cbe6d3d5ceae6c0ff4965d1529bc393d6698769e7fc87105f5df5ce29d479238

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