Malicious PDF — malware analysis report

Static analysis result for SHA-256 857e106178104fe6…

MALICIOUS

PDF

74.8 KB Created: 2021-04-06 14:39:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00e1c03803c949759b2041b1af7cd683 SHA-1: b8801526d853a69b9a546d6b67499ee616d3b974 SHA-256: 857e106178104fe6b87aa1a1db458f185c0db61a7902d3d4cb2825f4b39a1fb7
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_URI' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect the user to harmful content.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crophysi.ru/wix?keyword=2020+school+calendar+miami+dade
    • https://cdn-cms.f-static.net/uploads/4402503/normal_60419ec0139b6.pdf
    • https://cdn-cms.f-static.net/uploads/4491169/normal_600c090a4295c.pdf
    • https://cdn-cms.f-static.net/uploads/4469119/normal_603280e22c073.pdf
    • https://cdn.sqhk.co/koditisalupe/FgfrxOB/ruwatiluf.pdf
    • https://cdn-cms.f-static.net/uploads/4380854/normal_6056f0c399afd.pdf
    • https://cdn.sqhk.co/gulifunanale/2BE9k1S/best_ps1_games_for_android_emulator.pdf
    • https://cdn.sqhk.co/lisupixiwe/iehbKjj/garrett_bucket_list_family_age.pdf
    • https://cdn-cms.f-static.net/uploads/4459318/normal_604d0a9d5cd74.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_649e19e7a4c7421b8caef70a19db4e0d.pdf?index=true
    • https://s3.amazonaws.com/lemerisinivum/reiki_level_1_attunement_steps.pdf
    • https://2e96d104-cacc-4af9-914c-411927af6089.filesusr.com/ugd/0f866b_7a0879ce92e34799aa854da43e4893ee.pdf?index=true
    • https://f0198b83-f3fe-41b4-8315-bacd7eabb238.filesusr.com/ugd/2b3f46_37e749dda70641d5ae4c9c994b0a411f.pdf?index=true
    • https://6b551870-9d71-4c88-87ac-30bafd697196.filesusr.com/ugd/b27e13_067bbac7e78b4e7eaf33e5940b9e66e5.pdf?index=true
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_db913c5e9dcf4a50bcf799a20d46e3e8.pdf?index=true
    • https://7be8961d-effb-4c78-a255-78c3c9f0be09.filesusr.com/ugd/3dd68e_27598a80e36e4af386caca138a56a2d5.pdf?index=true
    • https://a2c67b61-a01d-4053-b7ad-f1487bca8054.filesusr.com/ugd/24853a_9f2a2251dea1451d8f6b50b17bf53b64.pdf?index=true
    • https://0a3880f2-9bda-4900-b484-73a003b8a878.filesusr.com/ugd/3cbe5d_25d12de0ef864d7086c8d5f7f792bc46.pdf?index=true
    • https://7fd672c9-0ac8-42d3-9d3c-9ebb2fbea2b4.filesusr.com/ugd/92785a_c1ba9759650549d0a8985d4218644150.pdf?index=true
    • https://dcd55a6f-f4d9-4ab7-9ea0-0dac4ffa5d6f.filesusr.com/ugd/f7cbe4_a0540831c813492cbb15f9f889ddd4cc.pdf?index=true
    • https://s3.amazonaws.com/bajuse/65898104587.pdf
    • https://8d684a1e-4078-49cd-b336-05adf09473b6.filesusr.com/ugd/2b25e8_d156d3b0df7b466ba32573491c4c4fe6.pdf?index=true
    • https://16fd3b15-5541-4454-9538-28daacbf497e.filesusr.com/ugd/e32576_98a15922c9e045949012cb15c9b1d290.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4a2.bin
cf543f10cf037921faecbff4d19a9023a4525a619615d6a65f347eee64657d8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A2 5356 bytes
font_01_sfnt_off0000f6aa.bin
8f011cd49e27d1c5a58c61ddad4b50b355ecae808a158c789808199646961ea1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AA 10916 bytes

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