Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b3b07dc7a6b33f6…

MALICIOUS

PDF

103.2 KB Created: 2021-05-25 06:08:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2d3931b07c7e58509f2ac0e8b666d85a SHA-1: 21e233e573aaf577ea2f373cdfe05136b8c639fd SHA-256: 2b3b07dc7a6b33f685240e353110e089efd1363edc91df5dd1a6659fa72bff07
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to PDF files, suggesting a link farm or SEO poisoning tactic. The primary URL, 'https://maypoin.ru/strik?utm_term=how+to+set+up+amazon+echo+plus+2nd+generation', is presented as a guide but likely leads to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/strik?utm_term=how+to+set+up+amazon+echo+plus+2nd+generation PDF link annotation
    • https://rejobasagiletez.weebly.com/uploads/1/3/4/6/134642313/8d57f8df8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470228/normal_5fda581b4be56.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497666/normal_5ff4eae3a1b91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417644/normal_6017dbaa2c529.pdfIn PDF document text
    • https://siwevobone.weebly.com/uploads/1/3/5/3/135317475/nujuj.pdfIn PDF document text
    • https://pawawejovotete.weebly.com/uploads/1/3/2/8/132814611/6909171.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/wotodedaruzuk/cactus_mccoy_free_for_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d7cbe36-81d2-44ba-8e38-ff7f91ef37b6/85091676373.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/82705879084.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/71419948690.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50d09528-0e22-4700-936d-94f991683b20/does_salicylic_acid_help_dandruff.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/51630712797.pdfIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/left_behind_series_for_kids.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/99196142462.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f9a9e57-6ec4-4753-a27d-860aa6efea64/sbs_2011_standard_iso_download.pdfIn PDF document text
    • https://s3.amazonaws.com/gopifu/dekexowaxul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2117bba4-cc76-4f43-9ffc-59932e3127f6/the_fox_and_the_crow_story_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wurivuve/23285839133.pdfIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/how_to_run_multivariate_analysis_in_spss.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_off00015370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15370 5720 bytes
SHA-256: 3e6073bf33f8938a245552c54f024588d5effa8abac752f50a10580492f57bd4
font_01_sfnt_off000166dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166DD 11764 bytes
SHA-256: 3e6446661598449c83f9bc5561e78de93d5016243a59de6b164554f5bf22b872

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