Malicious PDF — malware analysis report

Static analysis result for SHA-256 2094cdf4fc9d758b…

MALICIOUS

PDF

68.5 KB Created: 2021-03-15 18:40:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 08187e6ad42b3f851bf05a328da4b317 SHA-1: 58d0748a588b408ba70e0b5f0009a542651de9be SHA-256: 2094cdf4fc9d758b164b151f8a59a399fbc1d23997b797722547561e7633b2c8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/wix?keyword=baidu+browser+apk+uptodown PDF link annotation
    • https://cdn.sqhk.co/vamunidibu/zvjgk2d/mine_blast_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/pupevadojas/dvS1gft/painting_ideas_easy_cute.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419433/normal_6038fd6573722.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470027/normal_5fc5a02d8e322.pdfIn PDF document text
    • http://luxasireku.sportsontheweb.net/sql_server_books_amazon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408324/normal_5ffa6a803cfdf.pdfIn PDF document text
    • http://jafixane.iblogger.org/sasavuxara.pdfIn PDF document text
    • http://fevofawemuwa.medianewsonline.com/salary_benchmarking_report.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381980/normal_5fe38f19988b7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lawupoxag.epizy.com/worksheet_on_possessive_nouns_with_answers.pdfIn PDF document text
    • https://8a89c5bc-485b-4808-980c-66c60e8d9908.filesusr.com/ugd/834936_3437dccc809747ddbe4d576e8cf5aebd.pdf?index=trueIn PDF document text
    • http://kesufelitam.rf.gd/22287075455.pdfIn PDF document text
    • http://vorasatijede.rf.gd/toshiba_tv_ge_universal_remote_codes.pdfIn PDF document text
    • https://e114ad41-1367-46fe-a5fd-427bf640f69d.filesusr.com/ugd/a63c55_3e7373850a8a48a6bd735bedd17e0de1.pdf?index=trueIn PDF document text
    • http://mesitineka.rf.gd/bosasarusogonuvobakigeki.pdfIn PDF document text
    • http://nuberifanarov.rf.gd/rubonazelanasera.pdfIn PDF document text
    • https://4f0754e2-f0c4-47db-826b-83042027646c.filesusr.com/ugd/7a11b0_fdf6d2fdc89d4c248c4cf2997c6c7390.pdf?index=trueIn PDF document text
    • http://moretavumafoge.epizy.com/code_org_answers.pdfIn PDF document text
    • http://tonavisuma.onlinewebshop.net/97253400972.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_off0000cda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA9 5268 bytes
SHA-256: bbdadd7fa4d7d904bc9d3e16819bfb51a36d9bbee2fdca44c3c466c274bdccb6
font_01_sfnt_off0000dfad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAD 11392 bytes
SHA-256: 0b78561c7c49922ee342e624bfa0bc3bfbfba063daac1a1eb5d61a67a0dc5eb0

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