Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ecd51544c602ff2…

MALICIOUS

PDF

84.6 KB Created: 2020-12-10 16:42:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 1910243614fb2b4e05561a5bd571f9fd SHA-1: a63e34a65fe53d2299bdf1dbea5ebb6b7ba1085c SHA-256: 9ecd51544c602ff2159a35b8e35352b3ff994fcc72ed3339413f81176b257989
154 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, with one prominent URL being trafffe.ru. ClamAV also detected the file as 'Pdf.Phishing.Trojan'. The presence of numerous external links suggests an attempt to redirect users to potentially malicious sites for phishing or malware distribution, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8238

Heuristics 4

  • 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
  • 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://trafffe.ru/aws?utm_term=android+memory+cache+example PDF link annotation
    • https://miboxijudowisu.weebly.com/uploads/1/3/4/4/134491333/f9d0af5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385848/normal_5fba7f69d5a4d.pdfIn PDF document text
    • https://zalopajozi.weebly.com/uploads/1/3/1/4/131453352/desedopofato.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370078/normal_5f88a6ba2e569.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc5d7c15e8e827d42afc458/t/5fcd7981662d5e24e0b89592/1607301505632/piwolofafexavuzafesesotoj.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6b1d9403f5353fdbe0a77/t/5fd220abef89ac66837ec64f/1607606443969/forever_after_all_lyrics_luke_combs_release_date.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/72111294344.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/25772926478.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1015360f2895dc1e86a3c/t/5fc2ef46e6d49a06bbf436e2/1606610759217/word_whizzle_answers_composers.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbffbf92e34347c703edab4/t/5fc0dfe6145a8629dcd16937/1606475751147/thy_word_piano_sheet_music_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5100a0d2-bf42-49b6-b063-b6c410b78b4b/kaspersky_reset_trial_club_3.1.0.29.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/borgerforslag_om_sundhedsplatformen.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc59aeaea4a794d566534d6/t/5fd16536880fa23343c70d3d/1607558456230/chemistry_crossword_puzzle_with_answers_and_questions.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbfd3c824b06a7eb3f8da22/t/5fc14def3c02f22b9d3d5123/1606503919264/5629061000.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/4654243692.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc10dd611f6a419848684c6/t/5fc516d74e98326c02b2bbdb/1606751961484/guided_reading_activity_16-2_us_history_answers.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001268b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1268B 23708 bytes
SHA-256: 9e82164b37e69a33514ed1d1d9588e77a962700a4349d0f32417de2cd37c97be
font_00_sfnt_off0000ede5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE5 5000 bytes
SHA-256: a4d6b001a52783f361f8a1a80712a8c97a2ea1ab22653d0c09afa72f0b611cbe
font_01_sfnt_off0000fea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA8 11640 bytes
SHA-256: a0834f21d3fb72f6009de5f60b0248721d3ec42f5a382b8cf74da91d3b807618

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