Malicious PDF — malware analysis report

Static analysis result for SHA-256 d12bc6d44d0114b7…

MALICIOUS

PDF

110.3 KB Created: 2021-03-09 12:12:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4eb883d60793ecaf2985bc37750853c5 SHA-1: e8b46b704b1ef52d5219383216e0990ff35af67e SHA-256: d12bc6d44d0114b75b383b42b3c0269bb72203d5b9bb64357c04a315566d78b4
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm designed to direct users to other sites. One of the embedded URLs, 'https://kuzutuzo.ru/wix?keyword=chiisana+koi+no+uta+lyrics+meaning', is presented in a context that suggests it's a lure for search engine optimization. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/wix?keyword=chiisana+koi+no+uta+lyrics+meaning
    • http://xepivutede.22web.org/70669767666.pdf
    • https://cdn.sqhk.co/dasadogiso/jeibLGz/hyperspace_beck_vinyl.pdf
    • https://cdn.sqhk.co/busumodofu/hjC87Yb/war_card_game_online_with_friends.pdf
    • https://midumusifefo.weebly.com/uploads/1/3/5/4/135401272/cce0ff4.pdf
    • https://kasapumaf.weebly.com/uploads/1/3/1/3/131397987/e32d5a81ced810.pdf
    • https://cdn.sqhk.co/litojavu/hhGzjbS/wusalebamawefumo.pdf
    • https://cdn.sqhk.co/baluwofuk/Tjd6cje/free_online_bucket_list_maker.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/silubebebefuju/android_version_code_gradle.pdf
    • https://s3.amazonaws.com/pevuwarobuvowa/nepugukotemof.pdf
    • https://587b455d-cc79-4428-8e80-a8b75ce23bca.filesusr.com/ugd/021ec8_20444044dc254e8bb97d522254fb70da.pdf?index=true
    • https://s3.amazonaws.com/jazamerijekufol/total_body_strength_training_for_runners.pdf
    • https://36fc1fe3-b646-4cc1-b6e9-de51469aea27.filesusr.com/ugd/3eb4bd_fa925ebf26f14afd99116b669ee4e0ae.pdf?index=true
    • https://s3.amazonaws.com/gudukupir/letudejososofi.pdf
    • https://8a5a474a-a671-4857-921d-d1df0ee72544.filesusr.com/ugd/523716_079269874a614faa958dac0745a8ae32.pdf?index=true
    • https://e50eee24-2d95-422d-8083-6f618d95927b.filesusr.com/ugd/594ae5_a222a2dd40d24c168b30e86426b6c0c2.pdf?index=true
    • https://793776f3-68b4-44d3-947a-596ce2c6f652.filesusr.com/ugd/4e977a_564a48230ba44503be251b9cb6feb9b0.pdf?index=true
    • http://dokused.epizy.com/gravesend_reporter_twitter.pdf
    • https://a819be37-316e-4347-83bc-b067fb6953c8.filesusr.com/ugd/d5662a_ef63b09ef3754d598086e7c2d60556f4.pdf?index=true
    • http://diwevobu.rf.gd/61814898717.pdf
    • https://8c1dc56a-a131-4b43-acff-3635b9115217.filesusr.com/ugd/90423f_d34f7f73a49a4d62ab19a334e12e1ace.pdf?index=true
    • https://s3.amazonaws.com/vuzotisenixava/24034962079.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f677.bin
1ab9356e55eb3ef0e6cc84617c0343d0541ee82d71a8a346cfedaaf75c21dea6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF677 38728 bytes
font_01_sfnt_off00016b8a.bin
e2657e0db7d5b31f077007fa85dea372ff31f2a12507afa9a2639e773f9c8567		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16B8A 5284 bytes
font_02_sfnt_off00017d5e.bin
2e909ace16793b07ff368aa4b5252719a1ad8d26b45c37f8bfafb77d3d53b157		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17D5E 14908 bytes

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