Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b94399c4446aef2…

MALICIOUS

PDF

76.7 KB Created: 2021-04-27 01:07:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 761ec3af61edda329ce5d314efd3c2ef SHA-1: 189c47a545591c23fd5b5a8b7e39a198e7fdb440 SHA-256: 3b94399c4446aef27adf8ec4bc3f0dc4e6f055aad8c39423be84b6c75e5e49cb
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, contains text related to 'crystal growing kits' and 'wkhtmltopdf', suggesting a lure to a malicious site. The presence of external URIs and the ML classification strongly indicate a phishing or scam attempt.

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://zajinet.ru/strik?utm_term=how+crystal+growing+kits+work
    • https://cdn-cms.f-static.net/uploads/4475209/normal_6033f9994be13.pdf
    • https://cdn-cms.f-static.net/uploads/4475864/normal_606e407adf965.pdf
    • http://redirerer.medianewsonline.com/bhagavad_gita_full_in_tamil.pdf
    • http://gaxesujite.medianewsonline.com/fonojepexo.pdf
    • http://jaralet.getenjoyment.net/balance_sheet_of_reliance_company.pdf
    • https://jikovezogid.weebly.com/uploads/1/3/1/4/131407088/wesomezekozus.pdf
    • http://fogejebimo.scienceontheweb.net/89499808311.pdf
    • http://klossheff.xyz/allok_video_to_3gp_converter_freecge32.pdf
    • http://idclick.cash/computer_ki_paribhasha_english_meinf3prr.pdf
    • http://gazajujana.mygamesonline.org/49162890330.pdf
    • https://cdn-cms.f-static.net/uploads/4403561/normal_600a6155308bd.pdf
    • http://sekujirimabasas.getenjoyment.net/dulefejanepopirijuf.pdf
    • http://zugasanuko.getenjoyment.net/whats_the_difference_between_joy_and_happiness_in_the_bible.pdf
    • https://munerojepoges.weebly.com/uploads/1/3/4/0/134042508/fawedegosos_wulazomurol_jadapo.pdf
    • http://gayerkan.com/58473959784a2c4g.pdf
    • http://xijivedijimidip.mygamesonline.org/texto_argumentativo_sobre_los_videojuegos.pdf
    • http://tuwukadinem.mygamesonline.org/koxoji.pdf
    • http://xofitazuregokud.mywebcommunity.org/yellowstone_campground_map.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://noroved.myartsonline.com/free_converter_to_word_download_full_version.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeb1.bin
366c6227183d67ae2d3e21875d8c0b0cae87fb553c7f22f01821bf061e1d759a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB1 5184 bytes
font_01_sfnt_off00010080.bin
8cccd221ee890b2bc00289ba8b3556dd69f791f121071293667f75f0443ab4aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10080 10776 bytes

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