Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4907f91cdaaba57…

MALICIOUS

PDF

98.8 KB Created: 2021-03-31 23:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: fa04c0837cb229852731d4504b2a9ee9 SHA-1: c234246b2e87bed876a5c9ba1c5c433820a03799 SHA-256: f4907f91cdaaba574b2744327a985cbfe24057db50411eda54f843404261c902
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9992

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://gimoguvi.ru/wix?keyword=mini+shelties+for+sale+near+me PDF link annotation
    • https://cdn.sqhk.co/zawafolor/igphiM6/55945264258.pdfIn PDF document text
    • https://cdn.sqhk.co/duxadikoti/aggfiaR/space_survival_games_xbox.pdfIn PDF document text
    • https://cdn.sqhk.co/gejixoneku/icLTgcX/voice_over_acting_coaches_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/padasagam/tjfijQT/how_to_test_micro_switch_on_golf_cart.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/sefepugolupalax/1645048287.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/acc_aha_acute_decompensated_heart_failure_guidelines.pdfIn PDF document text
    • https://0503187d-52cd-4237-9521-a3cb9bf551ae.filesusr.com/ugd/5bb01c_bc76c8dda8004a959f3094a0666eb776.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/animal_farm_movie_vs_book_essay.pdfIn PDF document text
    • https://s3.amazonaws.com/sabegokek/hempel_foundation_annual_report.pdfIn PDF document text
    • https://01d7ec8a-e38e-4e33-8c76-1be31754498b.filesusr.com/ugd/24d943_e57c4eb401dd4f72bf734adbbec38ca1.pdf?index=trueIn PDF document text
    • https://254a6a59-343e-4b7e-907c-c4819e171fff.filesusr.com/ugd/decf6f_cf032a46a4154245b7fbb992dff48d57.pdf?index=trueIn PDF document text
    • https://8c4778c4-ed17-4cf1-86f9-5448e21c5c15.filesusr.com/ugd/6da380_2065ad9eed8b4b18b130271c3a74c16b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vosimalume/diva_cup_user_guide_section_b.pdfIn PDF document text
    • https://05efeaee-ea5b-4dc8-bddc-a5098cc0dcbd.filesusr.com/ugd/c06c30_562b7f12c2e945bab4ecb9c5c1f96ad0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/38383792817.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1eed5e81-c297-4108-a90b-5da255ff6e23/pentair_superflo_1.5_hp_capacitor.pdfIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/pudetadenobuledafoma.pdfIn PDF document text
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_4b30df4a8e45419f86c53e4bce906af0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/xenitanifenuzaze.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/15838233630.pdfIn PDF document text
    • https://s3.amazonaws.com/kumasala/59107114563.pdfIn PDF document text
    • https://28546a20-d0cc-4b82-bb4f-6711990cd5a3.filesusr.com/ugd/0bcf16_71a67c3582ab469d857812f02531cb5e.pdf?index=trueIn PDF document text
    • https://1d78cdce-0032-4a75-b9f1-030f6b068c24.filesusr.com/ugd/32f660_419e167b71824401bec85cf59998aef3.pdf?index=trueIn PDF document text
    • https://c1bbde11-5cda-4f7c-8b74-b2fe90b484f5.filesusr.com/ugd/1c8c6c_01246a71187141ff960403a74cec0848.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/51a0aa56-6075-470a-9b22-66a7a1c9cf1f/65572582948.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_off0001434d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1434D 5012 bytes
SHA-256: f82c655bd4c42b0857461b88cfe698f464c14036103cde8520eaef16c0aefc74
font_01_sfnt_off00015432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15432 11680 bytes
SHA-256: 87588f2de3452f2de8ebb42d94ffd60e649c27628f8adc2dea7df534e68484e8

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