Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6be03237aa5b5e0…

MALICIOUS

PDF

67.4 KB Created: 2021-01-03 21:28:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 33affb7691b99b7345a79737ebf8b0b8 SHA-1: ee70bb017297fad60b721670a106f96a7fe6bd9b SHA-256: e6be03237aa5b5e08611b0aaca3c488ce3bb80de8c1ad5ca53225535b51776b5
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with a heuristic identifying it as a 'PDF_SEO_LINK_FARM'. The document body, though heavily obfuscated, appears to be a lure related to 'Mona lisa lyrics britney spears' to encourage clicks on these links. The presence of external URIs and the ML classifier's high confidence score indicate a malicious intent, likely to redirect users to phishing or malware-hosting sites.

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://traffine.ru/123?utm_term=mona+lisa+lyrics+britney+spears PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4443823/normal_5fb3312b3e193.pdfIn PDF document text
    • https://gixifufu.weebly.com/uploads/1/3/3/9/133999878/dobanurewolonowip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470960/normal_5fccdb75998c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386079/normal_5f8f725c92b10.pdfIn PDF document text
    • https://dumetokewip.weebly.com/uploads/1/3/4/3/134394823/1a1f430d5a99430.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sixolose/regression_analysis_by_example_wiley.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/sound_pollution_information_in_marathi.pdfIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/anaconda_3_python_3._6.pdfIn PDF document text
    • https://s3.amazonaws.com/juzalizuvar/crack_download_manager.pdfIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/vogozupomi.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/formation_amlioration_continue_black_belt.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/32315769901.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/vertical_farming_philippines.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/identifying_theme_worksheets_for_middle_school.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/interest_calculator_app.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_off0000cc16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC16 5176 bytes
SHA-256: 65622eda487d3451652542da777d590513e477464251bad86307d887bcd69e99
font_01_sfnt_off0000ddd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD0 10660 bytes
SHA-256: ddd443852abb89140fd4a97ff8e26cd22650701b3861be83592221dbfbd87276

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