Malicious PDF — malware analysis report

Static analysis result for SHA-256 c636a970dfb707f2…

MALICIOUS

PDF

81.8 KB Created: 2021-03-30 19:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6da2a0c7bade377a14236c366ff49ec SHA-1: ad78e01a63e21264321f787849f2354d44d09033 SHA-256: c636a970dfb707f2d96811196d190272ba8d9fd81802362f656309ed4b6d5ea1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. The PDF contains a large number of external links, suggesting it is part of a link farm or a phishing campaign. The primary URL, https://midufefew.ru/123?utm_term=pc+desktop+nature+wallpaper+free, is likely used to redirect users to malicious content. No scripts were extracted, but the presence of numerous external links points towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://midufefew.ru/123?utm_term=pc+desktop+nature+wallpaper+free
    • https://static.s123-cdn-static.com/uploads/4452850/normal_5fcce798c97f3.pdf
    • https://cdn.sqhk.co/mibupufek/9cdyifk/kroger_weekly_ad_bryan_tx.pdf
    • https://cdn-cms.f-static.net/uploads/4480182/normal_602259767ead1.pdf
    • https://static.s123-cdn-static.com/uploads/4366369/normal_5fcb65122cbdc.pdf
    • https://cdn-cms.f-static.net/uploads/4427785/normal_60383b677aa3a.pdf
    • https://cdn-cms.f-static.net/uploads/4389107/normal_605892adeec40.pdf
    • https://cdn-cms.f-static.net/uploads/4370087/normal_5fd840eee4132.pdf
    • https://cdn-cms.f-static.net/uploads/4420752/normal_5fd158c432252.pdf
    • https://cdn-cms.f-static.net/uploads/4412170/normal_602ca00466a8e.pdf
    • https://cdn.sqhk.co/vefusujix/bXgjhg3/mepovuruwevamejodebonimu.pdf
    • http://dijumefifa.22web.org/segoterefipakuwuraderurib.pdf
    • http://ninefuva.22web.org/kannada_birthday_song_free.pdf
    • https://static.s123-cdn-static.com/uploads/4450513/normal_5fddfd3c867bc.pdf
    • https://static.s123-cdn-static.com/uploads/4373998/normal_5fe3326c4275d.pdf
    • https://wallpapers-house.com
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://magomodatibotu.epizy.com/baal_veer_returns_1st_episode.pdf
    • https://38aad9b5-7a72-45b8-ac81-9fe73ce82000.filesusr.com/ugd/08338c_286412e5f0ec4e79ab934c8df32d9217.pdf?index=true
    • http://ninenibabum.rf.gd/aqualisa_quartz_electric_8._5.pdf
    • https://71347f20-8353-4153-bebc-dd2a28b3a5cf.filesusr.com/ugd/a382ee_9f2ebe5b6155461abd78abdbf5a285f4.pdf?index=true
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_975db64b12de43e8b71db58a206a66fe.pdf?index=true
    • http://jolavewavesuj.epizy.com/separable_differential_equations_worksheet.pdf
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_be4c3e6cda0f4bce894d87e65376cf53.pdf?index=true
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd14.bin
72095988b0afff479729a016e2e6cac62d85653b37888334ee585465c1a58069		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD14 5140 bytes
font_01_sfnt_off0000eea7.bin
61e6e4f4285978c9ad8daae6e1cbde36b15344630971aa054302c7a39e40c950		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA7 11104 bytes
font_02_sfnt_off000114a7.bin
d781c508aaf473e50263a6aabc3f4161b7fa10724c54bb8d35addee38a7f1c44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114A7 16164 bytes
font_03_sfnt_off000129a3.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129A3 4324 bytes

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