Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a8d611e38383b48…

MALICIOUS

PDF

81.6 KB Created: 2021-03-16 22:16:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 8287950a8d13a1f8ee3731d4113a39e5 SHA-1: ef4e4b4ccc80e5f3f0ddd96a06ee109e3e555ee6 SHA-256: 1a8d611e38383b4849bcd9d3a285cc3cc2ae76c928a71fb3606607324e21430f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which are SEO-optimized, suggesting a link farm or phishing attempt. The primary malicious URL identified is https://maypoin.ru/strik. The heuristic 'SE_CLIPBOARD_COMMAND_LURE' indicates the document may instruct users to copy and paste content into a command-line interface, which is a common tactic for executing malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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=maytag+bravos+300+dryer+not+heating PDF link annotation
    • https://lomameleni.weebly.com/uploads/1/3/4/5/134597964/joxosalazakuju.pdfIn PDF document text
    • https://samaruwopag.weebly.com/uploads/1/3/0/7/130738554/741d0286.pdfIn PDF document text
    • https://dujomujur.weebly.com/uploads/1/3/4/8/134883281/tokovilajivefejijaf.pdfIn PDF document text
    • http://loxuzemifa.iblogger.org/75506009605.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5e54d98c-4257-4cc7-9010-48f3df296eb2.filesusr.com/ugd/05240c_f7afcdceb43c4e2aaf9efc0bf763f142.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rumezo/25208949990.pdfIn PDF document text
    • https://87d5e434-dc39-4d64-8681-877d64e204d5.filesusr.com/ugd/5660ac_bf1df8b473324f44aed52a134fa7e8c8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fasudikek/jawbone_jambox_app_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/vive_le_civisme.pdfIn PDF document text
    • https://46c0acaa-de7d-4f46-84f0-c2cf1d8ff7d9.filesusr.com/ugd/ac1638_51a52e1ed6d64a12a947fd8a242945fe.pdf?index=trueIn PDF document text
    • https://edcb5511-827b-40b0-97c1-3499c313f96b.filesusr.com/ugd/0779a3_f8295c1acdea46f895dc8ba21e4b684f.pdf?index=trueIn PDF document text
    • https://2eeb51df-07ba-4372-80d9-1ef4646fc7f7.filesusr.com/ugd/6af210_73057769ee264fe898a1f2cb0732f9be.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zalomi/how_to_play_baldurs_gate_2_multiplayer.pdfIn PDF document text
    • https://383fd46b-cc41-47b7-9379-19c19d7bb1fe.filesusr.com/ugd/81c43a_00d8755298cb4916bdcea96b276d3f8d.pdf?index=trueIn PDF document text
    • http://gujugune.rf.gd/the_green_inferno_imdb_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/datarofapakil/ssrs_report_builder_iif_null.pdfIn PDF document text
    • https://3e1af3dc-cf37-4f58-935d-0a6065bc5ce9.filesusr.com/ugd/3ca236_4caabc2567a944c386bda64183255795.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/figugipopar/morgan_anaesthesia_free.pdfIn PDF document text
    • https://a9750898-a066-404d-a796-54a2f5ad13bb.filesusr.com/ugd/60231a_a4cf662938b247059077e8603a604f85.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/corbettmaths_2014_simultaneous_equations_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jevelel/dopisunujekebiziwake.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_off0001012c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012C 5668 bytes
SHA-256: c23af6c25ffeeab550823b2071c15a90aa61cda8fcf49c352ca7171b33f04160
font_01_sfnt_off00011485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11485 10808 bytes
SHA-256: ebeae508f83288a689253fc4788a01a528bd5fdfd842b84af2d577050236ff44

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