Malicious PDF — malware analysis report

Static analysis result for SHA-256 543f74b202c2e653…

MALICIOUS

PDF

76.9 KB Created: 2021-04-08 00:23:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e74b617bbbf7e9f49a722caeb3508806 SHA-1: 5168b4bdf8f5aef87fb2f9894d8c39f14730ddb7 SHA-256: 543f74b202c2e6530952fdd300dea5c50fc261314c15c97fc7f2891c86d90656
164 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one heuristic specifically identifying a 'PDF link farm'. The document body, though heavily obfuscated, contains text related to 'Wu tang clan song cream lyrics' and application metadata, suggesting a lure to disguise the malicious intent. The presence of many external links, combined with a critical ClamAV detection and ML flagging, indicates a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://ponafet.ru/strik?utm_term=wu+tang+clan+song+cream+lyrics
    • https://cdn-cms.f-static.net/uploads/4465685/normal_5fdbc82abeb77.pdf
    • https://cdn-cms.f-static.net/uploads/4446511/normal_6049d80c00bb4.pdf
    • http://kemedejovon.getenjoyment.net/makalah_aterosklerosis.pdf
    • http://bumasujofoj.getenjoyment.net/55511344586.pdf
    • http://pusewuvi.medianewsonline.com/58145100547.pdf
    • https://cdn-cms.f-static.net/uploads/4367665/normal_5fe62e636adcf.pdf
    • https://cdn-cms.f-static.net/uploads/4492871/normal_5fd33c938f4b6.pdf
    • https://cdn-cms.f-static.net/uploads/4476147/normal_601eab5a1f3c1.pdf
    • http://xelamoxadavas.mywebcommunity.org/aos_generals_handbook_2020.pdf
    • https://cdn-cms.f-static.net/uploads/4455196/normal_602664bb0f478.pdf
    • http://kimisorunutom.medianewsonline.com/prepositions_of_place_in_the_city_exercises.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xewamejixolefaj/windows_10_tinhte._vn.pdf
    • http://tigodovujoxam.rf.gd/clinical_laboratory_tests.pdf
    • https://30621b86-6952-4b41-80af-4d24d830bc7c.filesusr.com/ugd/122077_746a682fa4034023b364fc901ff53c60.pdf?index=true
    • https://s3.amazonaws.com/luxaduzimase/wijemojisijowoget.pdf
    • https://d451e762-8e00-4155-9971-9512d28d2528.filesusr.com/ugd/b52961_af283ea1abe844a395f4582701b4c61a.pdf?index=true
    • http://biforobajimebug.epizy.com/invoice_template_html_css.pdf
    • https://s3.amazonaws.com/kexamoxusinixu/easy_piano_sheet_music_with_letters.pdf
    • http://suzogoga.epizy.com/creature_film_full_hd.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_off0000eead.bin
183bcd8d511f42751bdfaabc64a5e6b52476af67622ed258b1dca21874abcbac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAD 5236 bytes
font_01_sfnt_off00010078.bin
42fc74a9cb2c1f6913d08af891bf478446a6eb2a1e72488eb0f216a76cc81eff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10078 11252 bytes

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