Malicious PDF — malware analysis report

Static analysis result for SHA-256 331bd992de6ad7ad…

MALICIOUS

PDF

81.6 KB Created: 2021-05-06 00:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7eefef21e42333c6ac439261230cb674 SHA-1: 498a291786c22a139ee6d1ab47deb5af0990d1f5 SHA-256: 331bd992de6ad7add75498ac1645fb7a7e842586d445e27119b2642531a89664
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://jottigo.ru/strik?utm_term=what+is+cause+and+effect+diagram+in+hindi PDF link annotation
    • https://lezisonesu.weebly.com/uploads/1/3/5/3/135339892/5907122.pdfIn PDF document text
    • https://pugiputofal.weebly.com/uploads/1/3/4/7/134740318/536e5bd.pdfIn PDF document text
    • https://vudegerolo.weebly.com/uploads/1/3/1/4/131452783/5069059.pdfIn PDF document text
    • https://xigizimevavas.weebly.com/uploads/1/3/5/9/135982966/c2a6f.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/faluzotixupi/4th_grade_grammar_review_worksheets.pdfIn PDF document text
    • https://c5e26362-acc3-4c40-9db4-ce0cbd355080.filesusr.com/ugd/681527_5db83f0a274d49f7b05a04b809d11095.pdf?index=trueIn PDF document text
    • https://b1d4f555-1eac-4d61-aa83-27206cf3ee4b.filesusr.com/ugd/1706f5_d5e0ef9e667a488682d8ef0f7139d6b6.pdf?index=trueIn PDF document text
    • https://1d942ef5-affb-47d8-8f99-70a3d187b733.filesusr.com/ugd/3283b0_0d71206e252745d3aee0823943eafb84.pdf?index=trueIn PDF document text
    • https://16e729f2-8c5c-4787-b670-14aeba6c5e03.filesusr.com/ugd/ac55e2_f0b83616dbfa4e44812a8bf4a09eb862.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lemerisinivum/oral_b_brush_heads_price_comparison.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/bhojpuri_film_sasural.pdfIn PDF document text
    • https://s3.amazonaws.com/sajezife/55117419357.pdfIn PDF document text
    • https://cbb9655c-b60d-4095-8c1c-bb5f9a2903c5.filesusr.com/ugd/4dd980_15674f1be423477b9b37b5b6c513edca.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dotivaf/gypsum_board_ceiling_details.pdfIn PDF document text
    • https://55963656-6eb1-4b25-bcd5-bb835d65808b.filesusr.com/ugd/0064ae_89787d779b93446882c63c411984efa6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/998c067d-50fc-4f73-86ac-71c1bb60d7a7/roland_micro_cube_rx_bass_amp_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8daf55b5-4cb4-4476-abb6-43d8bfb6f6a0/wunder_von_bern_torwart.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/82442453634.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/manuale_istruzioni_stampante_samsung_xpress_c480fw.pdfIn PDF document text
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_f8f71b5cd23e4d3990c6aeb9eb39559f.pdf?index=trueIn PDF document text
    • https://bf130ee1-1463-4c69-9604-1b23772ced92.filesusr.com/ugd/b4609a_9edf5a3b238f444b93f02654e9867b9f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bivanud/noxixubupejegurapijalip.pdfIn PDF document text
    • https://99516632-72ce-40f3-a9a1-a01c91361c65.filesusr.com/ugd/e42c35_e4a0ed68344440ce9b7047d2de668840.pdf?index=trueIn PDF document text
    • https://9c12218e-e157-4070-b33f-4467b3cb42bb.filesusr.com/ugd/0c60a0_fc5c97095db24d24a7588e69fb3c163c.pdf?index=trueIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA4 5416 bytes
SHA-256: 231179280934d3c3a8574fe455f85f79e051a2730078b8111da2d620841bfb04
font_01_sfnt_off0000fef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF2 10520 bytes
SHA-256: 2aae384d4b12ee91a08d4e0793904b1e9f03268d2dccd20c13639cbf5ad83d65
font_02_sfnt_off000122f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F8 16204 bytes
SHA-256: 31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf