Malicious PDF — malware analysis report

Static analysis result for SHA-256 6937ef7f829d0150…

MALICIOUS

PDF

74.8 KB Created: 2021-03-30 07:18:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 83fe8cdafa541d903c3dc5270541d635 SHA-1: e4cdd061ebdb5a5703fc1358f1ce41a4dc7e47e4 SHA-256: 6937ef7f829d015052ebb0e6bb1804452d65b37f51dbfa292ebcda6c045daab1
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 content. It contains a link farm of external PDF documents, with one primary URL pointing to 'vilenefex.ru'. The document body, though heavily obfuscated, suggests a lure related to 'Processus de certification iso 9001 pdf', likely intended to trick users into visiting the linked sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://vilenefex.ru/award?keyword=processus+de+certification+iso+9001+pdf
    • https://cdn.sqhk.co/kubepugemaki/hgespja/mini_world_block_art_guide_indonesia.pdf
    • https://cdn.sqhk.co/paxabuxutujo/jbLoOgg/vobunesolegig.pdf
    • https://cdn.sqhk.co/dasadogiso/heuGijl/natakawusigizofedunog.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ce83042b-5faf-46b5-bcbb-9b4d05ec7d33.filesusr.com/ugd/a31856_0721f1f69e6e4b92a1b7b9ea7e14e5f8.pdf?index=true
    • https://s3.amazonaws.com/wovugi/mizedivisuravepevev.pdf
    • https://s3.amazonaws.com/zemunomipazikez/lake_ontario_salmon_fishing_reports.pdf
    • https://eeeff038-21f9-42a6-bde0-cd945221d618.filesusr.com/ugd/9dc459_36217728121c4991a1b48b6dc062e31c.pdf?index=true
    • https://53002a68-e35f-4167-ac88-1ab9777d7e72.filesusr.com/ugd/f5bc2a_bcff3f69e72e46acb386774d596b597c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/da966923-6e18-42ae-aa6e-fd6823b78127/nopajiwagiwosawu.pdf
    • https://uploads.strikinglycdn.com/files/9818dc2a-0767-4bb1-b931-764b67d4eebb/how_to_contact_starbucks_rewards.pdf
    • https://s3.amazonaws.com/waxapoz/cheat_sheet_python_for_data_science.pdf
    • https://e5058785-d3d1-442e-b0ad-d0045053dde7.filesusr.com/ugd/17c622_9cf8379d1e624ba8931018cc2cc40468.pdf?index=true
    • https://uploads.strikinglycdn.com/files/42902221-287e-414a-97e3-7ce5c9428b70/mifadumovuvizori.pdf
    • https://fac30f9c-1bc3-4ff6-ac40-7ced1d2a170b.filesusr.com/ugd/3b7182_0ee3d1283f9a45f1ad0801bbc3c7fc73.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1daa90ba-8bcd-4690-bd9a-5f422aac2b38/22690618426.pdf
    • https://s3.amazonaws.com/posufij/gufogo.pdf
    • https://s3.amazonaws.com/guwutivupudutu/datofubej.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e126.bin
566695a65518269112122e58204718f298e02186705dbd222ec3224338e16533		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE126 5468 bytes
font_01_sfnt_off0000f3cc.bin
df5f22a378f57e762ec47a5bf7502e5c1a9953ce3dad3da94972c07f4c652e04		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CC 12832 bytes

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