Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7b8a927a154670e…

MALICIOUS

PDF

73.5 KB Created: 2021-05-14 12:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 202ab4c6f3e6e8bf789ab2228dcbcc0a SHA-1: b9210b7f61393ba30b81c8ff7073fa45828ce920 SHA-256: f7b8a927a154670ec0f6d4217d2ba5b6328ce68c3a204307dc6539e82ea9cb0f
126 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs, with one specifically identified as a link farm on disposable hosting, suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection strongly indicate malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution attempt, likely using a spearphishing attachment vector.

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 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://xezojetit.ru/strik?utm_term=possessive+pronouns+worksheet+year+4 PDF link annotation
    • https://cdn.sqhk.co/kibizatududo/3ighbjj/vomametojajadivazamabi.pdfIn PDF document text
    • http://dalosizofovabes.medianewsonline.com/gojavikepis.pdfIn PDF document text
    • https://cdn.sqhk.co/zetikitor/dFjhz7q/idle_mine_breakout_become_mining_tycoon_wiki.pdfIn PDF document text
    • http://pemizirevubel.mywebcommunity.org/11381590289.pdfIn PDF document text
    • http://hurleyshamburgers.com/us_history_timeline_projecto44kj.pdfIn PDF document text
    • http://xalenupom.getenjoyment.net/how_to_do_a_data_analysis_in_excel.pdfIn PDF document text
    • https://cdn.sqhk.co/palazawu/lib4ibn/visusokunos.pdfIn PDF document text
    • http://lokubakodo.getenjoyment.net/fofidevow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449185/normal_6001d99527ec4.pdfIn PDF document text
    • http://lisolu.org/double_bed_bedsheet_flipkart1g34w.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380211/normal_5ffa0794a4edf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471474/normal_5fc650534b0e9.pdfIn PDF document text
    • https://cdn.sqhk.co/rapurakoke/cb5WJgh/wilupalulimubetusezeval.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/gapivegek/taco_bell_soft_shell_beef_taco_nutrition.pdfIn PDF document text
    • https://59cf682b-6680-4a08-8b8d-0472bab64ef7.filesusr.com/ugd/d7d6cd_a971cf9d49ff4cdd9df28694d0ffa5c3.pdf?index=trueIn PDF document text
    • https://00eaa6b3-f026-4720-b00f-fafb40066352.filesusr.com/ugd/d498be_9e152159ad694de5b430b08b99b55681.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lepefi/telugu_private_album_audio_songs_free.pdfIn PDF document text
    • https://4ac36a2f-1533-488b-b282-cf34cdace458.filesusr.com/ugd/bcfc12_f2e3f901a8b749aa8a1be8ab8f8c8601.pdf?index=trueIn PDF document text
    • http://xogaduzop.atwebpages.com/mario_castelnuovo_tedesco.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/vasufugerevepazanedoju.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_off0000e035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE035 5284 bytes
SHA-256: 233cadc2b1e77b245be8b0f30039f216b8584ecacd0955fd29ace8fdee83b767
font_01_sfnt_off0000f249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF249 10868 bytes
SHA-256: 026a63110cc6d0db422ba2cbc2277f080821217647f9f5c5cb8a70dcaf4fa505

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