Malicious PDF — malware analysis report

Static analysis result for SHA-256 2204873c2addf4a7…

MALICIOUS

PDF

84.2 KB Created: 2021-02-26 04:51:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 053f13a95c73f6cc4767905ab1a46165 SHA-1: 30e8b46792a9fd0de3f69e884ad712b0e2e5b9df SHA-256: 2204873c2addf4a77f92345b0c5f5ac36ef697e726fdd14e991a96f0ca5b2075
182 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and links to known malicious redirector infrastructure, indicating an attempt to deliver a malicious payload. The document body, though heavily obfuscated, suggests a lure related to 'League of Legends patch notes 11.4' to entice users to click the malicious link. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crophysi.ru/strik?utm_term=league+of+legends+patch+notes+11.4 In PDF document text
    • http://keepxufi.space/ketefotenewerijafukevevukb8x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421637/normal_6032de8d48adc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408588/normal_602af345e8ba1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403408/normal_5fca97374d313.pdfIn PDF document text
    • http://fomilexavekol.22web.org/13701881570.pdfIn PDF document text
    • http://xawegap.mywebcommunity.org/bujidadoturi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443337/normal_6009da3d4ff75.pdfIn PDF document text
    • http://wimazosuwoxugij.66ghz.com/raligomofokokavak.pdfIn PDF document text
    • http://biggymstoe.com/candle_light_dinner_new_punjabi_songez6ce.pdfIn PDF document text
    • http://mikovil.mywebcommunity.org/logevogupedatokejumagu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://notaruk.rf.gd/alif_allah_aur_insaan_episode_34.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/xinarogosi.pdfIn PDF document text
    • http://fiforeru.atwebpages.com/mozonorale.pdfIn PDF document text
    • http://jufofokisib.epizy.com/49389690114.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/kangana_song_new.pdfIn PDF document text
    • https://s3.amazonaws.com/gazivemon/metapex_calcium_hydroxide_with_iodoform_uses.pdfIn PDF document text
    • http://wuwedilejom.myartsonline.com/what_are_the_features_of_organisational_culture.pdfIn PDF document text
    • https://s3.amazonaws.com/mixanaz/rifebakonazipalobed.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_off0001018a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018A 5436 bytes
SHA-256: cfdf37b7e0228277ae0f97f6b857c562e6ddb8ef6b9f9aa776b66f09ea287b3a
font_01_sfnt_off00011422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11422 15304 bytes
SHA-256: 05e6c74df2325ab504ecf0b052bedb1a71abcf48f3bee89ff1ae1d0d9bf9db12

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