Malicious PDF — malware analysis report

Static analysis result for SHA-256 b78ec4172fd1336a…

MALICIOUS

PDF

94.0 KB Created: 2021-03-28 13:02:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8d2b5425fd3e206a2ae103714b71738b SHA-1: c604b8d45e350881aa6f0e28c5f6c4fa9b5e02f2 SHA-256: b78ec4172fd1336a50424b4a2dff75f8a2f383a8bab150aa4cf354c725a3fc41
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. The embedded URLs and the PDF structure suggest an attempt to redirect users to external sites, potentially for phishing or to download further malicious content. ClamAV detection as Pdf.Phishing.Trojan further supports this assessment.

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=base64+pdf+to+image+js PDF link annotation
    • http://xipulax.iblogger.org/63874313027.pdfIn PDF document text
    • https://fojumujitugesi.weebly.com/uploads/1/3/4/6/134688065/1864256.pdfIn PDF document text
    • https://vorapitejure.weebly.com/uploads/1/3/4/6/134605364/3708512.pdfIn PDF document text
    • http://lovojat.22web.org/bemigame.pdfIn PDF document text
    • http://wevoselaxoto.66ghz.com/create_index_template_for_azure_sql_database.pdfIn PDF document text
    • http://zujonatuvetivux.iblogger.org/testout_network_pro_answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://valamujunitun.epizy.com/20366797573.pdfIn PDF document text
    • http://zenomidesedi.rf.gd/autodesk_maya_lt_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/tiniruru/how_do_you_describe_the_trend_of_a_line_graph.pdfIn PDF document text
    • https://s3.amazonaws.com/xalasawu/pisatowawepogas.pdfIn PDF document text
    • https://s3.amazonaws.com/daniwodug/courtin_in_the_kitchen_sheet_music.pdfIn PDF document text
    • http://romukebiguvux.rf.gd/fivetesivimol.pdfIn PDF document text
    • http://tukudapig.epizy.com/enoxaparin_davis_drug_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/wawegomeliba.pdfIn PDF document text
    • http://seralugaba.epizy.com/piano_christmas_songs.pdfIn PDF document text
    • http://volowunodevikel.rf.gd/mibadilavivusapi.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/66550794397.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/zuxejagitoxejuparer.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/dyspepsia_guideline__2018.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7D 5600 bytes
SHA-256: 11574ec0ad6b09ccc73a80a0fd517f04560fc0233c80622c4dedd0c995008e47
font_01_sfnt_off00011f8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8B 6520 bytes
SHA-256: 48f44e4c1c2da3be2d943891bf40b765aae2c48e24faa1b44da4d2768dd68c91
font_02_sfnt_off00013173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13173 6148 bytes
SHA-256: 0b38f6fd5e0b54bfa22d5adee1cfe00629fe134100fc7cfc1ad14a2ab7974207
font_03_sfnt_off00014153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14153 11888 bytes
SHA-256: 6477beda4aa27d7c10d372f9c96e2b7aa60c94ca28badea98cb76e5ef79dcc03

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