Malicious PDF — malware analysis report

Static analysis result for SHA-256 fab5847252c813f4…

MALICIOUS

PDF

74.5 KB Created: 2021-02-17 13:47:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: c343abc18cd9cc55e79083d4dfa91d9f SHA-1: dc52db72ad76a5bf4e89dc155eb5ff7fee1aa1e8 SHA-256: fab5847252c813f4962e8edbe59980710cb2f02e51d9eee1a0abb32251af0066
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files, suggesting a link farm or a method to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious sites or download further payloads.

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://jacksth.ru/123?utm_term=ethical+hacking+books PDF link annotation
    • https://wumifidadorubip.weebly.com/uploads/1/3/5/2/135298964/4371493.pdfIn PDF document text
    • https://cdn.sqhk.co/gisepavuv/ghHOieT/zekuwimupawus.pdfIn PDF document text
    • http://wuzulosijeg.22web.org/bangsamoro_basic_law_disadvantages.pdfIn PDF document text
    • https://cdn.sqhk.co/pozuwifofub/iCEGjj8/infinite_looper_video.pdfIn PDF document text
    • https://pojuzalik.weebly.com/uploads/1/3/4/2/134235388/4485661.pdfIn PDF document text
    • https://fusajebotiv.weebly.com/uploads/1/3/4/3/134320253/wirinupalumib-bexezuxota-wulebiribe.pdfIn PDF document text
    • https://cdn.sqhk.co/tatonabufule/vjdhcd7/87361914112.pdfIn PDF document text
    • https://cdn.sqhk.co/dosakupu/6TWtdlr/hollywood_story_fashion_star_download.pdfIn PDF document text
    • http://pufonorigaji.22web.org/6011612841.pdfIn PDF document text
    • https://nawikavo.weebly.com/uploads/1/3/0/8/130814462/zezotomofe_rovenovifire_lowisitiloseno_fawese.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/penefelomiju/62742851192.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/acronis_backup_recovery_10_advanced_server.pdfIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/functional_analysis_worksheet_cbt.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/binder_paper.pdfIn PDF document text
    • http://wewimolu.epizy.com/nuvepibobo.pdfIn PDF document text
    • http://fuvituze.epizy.com/18691300489.pdfIn PDF document text
    • https://s3.amazonaws.com/lejivugeleguwod/emulator_ps2_terbaru_untuk_android.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/new_action_movies_2019_mp4.pdfIn PDF document text
    • http://vepesupilet.epizy.com/assinatura_digital_invalida.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/2495383307.pdfIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/96881719477.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_off0000e6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AB 5128 bytes
SHA-256: 6b31e49fd75015e5aa971de2a571fff32ab89b95a3a63046e47d6bf75f17e6e3
font_01_sfnt_off0000f81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81E 10684 bytes
SHA-256: d371051d79d3295f0562c56bd98debd038042a18ede64fed7c848fe71562d767

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