Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7d783da45199eb6…

MALICIOUS

PDF

88.8 KB Created: 2021-03-31 22:32:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 346bb879e5ec4b94b19d43d31399936f SHA-1: e2327104981d31d3135c0968440d4b01395fab9c SHA-256: e7d783da45199eb66225064b528f1614b48c7fc3138c8a32902a9074809c9cf6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with a primary malicious URL being https://botokaw.ru/strik?utm_term=the+way+to+happiness+cult. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the heuristic findings strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/strik?utm_term=the+way+to+happiness+cult
    • http://jetanevuv.iblogger.org/bahaddur_gandu_film_songs_free.pdf
    • https://cdn-cms.f-static.net/uploads/4482863/normal_603f7e5ea9c77.pdf
    • https://cdn-cms.f-static.net/uploads/4413347/normal_602d977f5987f.pdf
    • https://cdn-cms.f-static.net/uploads/4382643/normal_6027eeefb6201.pdf
    • https://cdn-cms.f-static.net/uploads/4503214/normal_60219e565c733.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0e6cb701-8f7b-4155-aed9-c51d1f89e340/fabewerubu.pdf
    • http://sanikivatuma.rf.gd/4727669290.pdf
    • https://acfc0e76-311d-46af-9c13-f46c112eb424.filesusr.com/ugd/f90bad_fc810e6e6d8649829b04ea8434d524be.pdf?index=true
    • https://uploads.strikinglycdn.com/files/54829117-54b5-4d5f-94f4-fba06ff2fdd5/10101236446.pdf
    • https://uploads.strikinglycdn.com/files/d352251e-804d-4b36-af0e-18b0e33e0d9f/nombres_para_nios_sacados_de_la_biblia.pdf
    • https://uploads.strikinglycdn.com/files/f35f9f41-81b0-4590-987f-3896df97d836/advanced_vb.net_programming_tutorial.pdf
    • https://ecab545c-19d2-4654-b6ac-fb8b9749f5ba.filesusr.com/ugd/e5412a_1de022a299794cb59eca07d808a26cbc.pdf?index=true
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_b78bc8ba8b1a4f4cbe783606473ad395.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c04784b4-5ad5-4eda-a1b8-f4e7df8ee53f/tugemagibowufetenes.pdf
    • https://uploads.strikinglycdn.com/files/0a1e00cc-2de4-4b6d-9cee-7dfae3fb93ec/lg_g_pad_7.0_lte_price.pdf
    • https://367e539a-c541-4439-991c-4bf2bef2aa7a.filesusr.com/ugd/77d535_e6761125344c4997a106e273ec72f98e.pdf?index=true
    • http://xevivalekivo.epizy.com/windows_10_home_full_version_free.pdf
    • http://sobikunukozi.rf.gd/global_initiative_for_asthma_guidelines_2018.pdf
    • http://tevetozenirok.rf.gd/buxamexug.pdf
    • https://cee4a208-09ac-40e0-983f-4c2cc776acbe.filesusr.com/ugd/5ed537_2b425563736444119fc55a69a04cff34.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_off00011e31.bin
0676f685218341f5717d6e197614ac468c16c7188cd9ad09f44d636dbb677244		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E31 5068 bytes
font_01_sfnt_off00012f8b.bin
3422f2beb2a5944585add4563b2e4d79dc78355247f5e7f464f8f1bbdc7e1dbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F8B 11204 bytes

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