Malicious PDF — malware analysis report

Static analysis result for SHA-256 655e6daf42d8b505…

MALICIOUS

PDF

74.9 KB Created: 2021-02-23 20:56:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5f4996c491a25d19a718e642710d9886 SHA-1: c69d359522ff38eb79728743000cde287f69d927 SHA-256: 655e6daf42d8b505cf29757a94cabe760944f990b8db4dc7bfc889b74b5c915e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The primary external URI points to 'https://baarspo.ru/wix?keyword=system+of+alliances+allies', suggesting a malicious intent to redirect users to potentially harmful content. ClamAV also detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0', reinforcing the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://baarspo.ru/wix?keyword=system+of+alliances+allies PDF link annotation
    • https://wugovokida.weebly.com/uploads/1/3/4/3/134319073/pokim.pdfIn PDF document text
    • http://krokoboko6.xyz/851422261094z2y0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390638/normal_5fe7959adb1ed.pdfIn PDF document text
    • http://shoppermarket.online/what_is_the_significance_of_literature_in_our_lifel2qix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384164/normal_60090e77b464d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410015/normal_60016768dc4d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413225/normal_6023c78415863.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367959/normal_602f114225191.pdfIn PDF document text
    • http://cz-nitrof.website/pirates_caribbean_1oceep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485926/normal_6015b8429479f.pdfIn PDF document text
    • https://wizamivakujeji.weebly.com/uploads/1/3/4/5/134526499/620663.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393893/normal_5fd980b76b06c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450043/normal_5fd8329f8ac17.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bupijila/d_d_4e_artificer_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/percy_jackson_son_of_the_river_styx_fanfiction.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/excel_macro_spreadsheet_name.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/bubagotuturi.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/38703158396.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/florida_dmv_written_test_study_guide_free.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/arquetipos_helio_couto.pdfIn PDF document text
    • https://s3.amazonaws.com/voxazedisula/jquery_blob.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_off0000ea3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3D 5136 bytes
SHA-256: 635a344111f3c4c97abf8ae83300de0b173ee1cdc2c7b3b3a37bc0eb33f30088
font_01_sfnt_off0000fbb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB1 10092 bytes
SHA-256: f5d6ed64ca4d25934994dce2a94b7ed88cbe9ba7abbb9db480c55a84411c9409

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