Malicious PDF — malware analysis report

Static analysis result for SHA-256 7226fc2d63faf521…

MALICIOUS

PDF

77.0 KB Created: 2021-02-28 15:34:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 0ee87fe251546df22e943df645388e27 SHA-1: bc640db0a53fd8608164a23fc29db8d8056ce514 SHA-256: 7226fc2d63faf5217ed2ea1009c8d34779e174d42600ca38bf66d559f8498624
156 Risk Score

Malware Insights

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

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-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://nipisod.ru/123?utm_term=how+do+you+spend+your+holidays+10+lines PDF link annotation
    • http://sijemogezabusa.sportsontheweb.net/writing_about_writing_a_college_reader_third_edition.pdfIn PDF document text
    • http://timinome.getenjoyment.net/bivunudobarofasisi.pdfIn PDF document text
    • http://puvepum.getenjoyment.net/why_am_i_wet_girl_thats_rain_lyrics.pdfIn PDF document text
    • http://xawegap.mywebcommunity.org/18077897045.pdfIn PDF document text
    • https://jotozured.weebly.com/uploads/1/3/4/5/134588142/1818eb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tiniruru/wulexeredigog.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/4591342748.pdfIn PDF document text
    • http://wenares.myartsonline.com/plantronics_cs510_wireless_headset_user_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/musokejixami/lumowetetaguj.pdfIn PDF document text
    • https://s3.amazonaws.com/vudivuzakal/30_day_green_smoothie_diet_results.pdfIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/64498027612.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/75555298128.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/guzebomizekoruxaxaravuba.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/20017459261.pdfIn PDF document text
    • https://s3.amazonaws.com/kujesulad/75123244396.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/xetal.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE410 5196 bytes
SHA-256: 6c5dd1d011c8567db5c7b5cb005df970c5d9476814ba3463593ebbe5b9bf12be
font_01_sfnt_off0000f5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B7 10292 bytes
SHA-256: 5638dc49a2a0d4620fabe57ce49b7eb893637de06a002189ef75a08e9e6073b5
font_02_sfnt_off00011890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11890 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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