Malicious PDF — malware analysis report

Static analysis result for SHA-256 c766ea124c053119…

MALICIOUS

PDF

83.9 KB Created: 2021-03-21 23:26:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5fe0ca25c1e40d23072b7d3706aee571 SHA-1: 2ebee4b738f7ba72719dbb93fbc7cb7ee2572b71 SHA-256: c766ea124c053119c7d1af5d4ff5a723cd3ea14aa091cc917ad5f342a57c79c5
164 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is a link farm and uses an urgency lure, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support maliciousness. The embedded URL likely leads to a malicious site designed to exploit the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://mezovuduw.ru/wix?keyword=stellaris+psionic+entity+strength
    • https://cdn-cms.f-static.net/uploads/4369907/normal_601b73bd8148a.pdf
    • https://cdn.sqhk.co/bedogipaxog/cKjbUgf/mavasogaxuxiwezokovu.pdf
    • https://cdn.sqhk.co/kogewole/dFgdgjM/dog_clear_runny_nose_sneezing.pdf
    • https://cdn.sqhk.co/letarezetap/CtjdgtM/fast_money_halftime_report_cnbc_fix.pdf
    • https://cdn.sqhk.co/vofonowul/dyhe9ja/download_extreme_racing_adventure_mod_apk.pdf
    • https://cdn.sqhk.co/bupabumo/cjjgfgd/ai._type_bot_keyboard.pdf
    • https://static.s123-cdn-static.com/uploads/4388827/normal_5fcf677031fba.pdf
    • https://cdn.sqhk.co/dogutadova/dHjeWjd/eve_echoes_discord_trade.pdf
    • https://cdn.sqhk.co/munemuzabuk/bheefGp/bubble_letters_microsoft_word.pdf
    • https://cdn-cms.f-static.net/uploads/4490133/normal_602c647a234b1.pdf
    • https://cdn.sqhk.co/pojizurigos/2hdAeig/popular_wars_mod_apk.pdf
    • https://cdn.sqhk.co/loxexafetivu/eKgj764/tajaluza.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rujimidujek/el_alcoholismo_en_mexico.pdf
    • https://3568c1c9-c281-4b9a-9ea9-d5d291e0176b.filesusr.com/ugd/e5d8db_84ea7f86fc834de087a0ff78d2c0f072.pdf?index=true
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_1895116c5d7643b7854e982d9530c121.pdf?index=true
    • https://15319a82-8c66-4906-b3c2-464277991f2b.filesusr.com/ugd/070acf_52e7d4adf2ff4fe6922b61e9713b9b6c.pdf?index=true
    • https://s3.amazonaws.com/tumuzu/protractor_appium_android.pdf
    • https://s3.amazonaws.com/lixuzo/beluzusaledarajamubomi.pdf
    • http://jalafugidovi.epizy.com/bases_matematicas_ufabc.pdf
    • https://s3.amazonaws.com/tevigotu/comptia_a_certification_exam_guide.pdf
    • http://xifetofaramil.rf.gd/early_river_valley_civilizations_word_search_answers.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_off0001092d.bin
b23aeaedc29192fc2a5b0685b4ec907a6ef352a8334521042c15da543e4b9006		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1092D 5400 bytes
font_01_sfnt_off00011b89.bin
08729010f916c9c69b33def72b5fbf923c938e1544eb523018cf1ba029568339		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B89 11144 bytes

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