Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6144b3b1fbab367…

MALICIOUS

PDF

91.7 KB Created: 2021-03-28 14:21:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e5150106bcefbe6cb6ede268e9df5a8b SHA-1: 57d597709ecb3cb46b5e74aa283f27914a685ac0 SHA-256: f6144b3b1fbab367a1acca863b387a363f323381cbee4a5280408825acf9bee7
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by 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 0.9998

Heuristics 4

  • 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://fokemale.ru/award?keyword=anatomy+and+physiology+textbook+online+pdf PDF link annotation
    • https://figapizezedop.weebly.com/uploads/1/3/4/3/134364787/tigulusupozomonosibo.pdfIn PDF document text
    • https://dapazigozasonim.weebly.com/uploads/1/3/4/4/134466252/vifewopowubal_romepufudo_gasuperufibo_repodotogakipe.pdfIn PDF document text
    • https://kitigenuripoduj.weebly.com/uploads/1/3/1/0/131070171/pibufuvobogu.pdfIn PDF document text
    • https://zififawatef.weebly.com/uploads/1/3/4/3/134384507/zemodoxotu.pdfIn PDF document text
    • http://ziwewixowele.sportsontheweb.net/bootstrap_4_book_free_download.pdfIn PDF document text
    • https://mujiborabasovu.weebly.com/uploads/1/3/4/5/134590634/diwif.pdfIn PDF document text
    • http://bisibometixo.mywebcommunity.org/us_constitution_with_all_amendments.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/tutapaxi/unknown_market_wizards_audiobook_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/schwinn_gateway_28_hybrid_bike_target.pdfIn PDF document text
    • https://ecf1b359-4982-44d9-836f-7e6f5fec4aa1.filesusr.com/ugd/da15c8_17e950d647934dde9380c7b1b589ae37.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nigimul/diwejejomesunuvawu.pdfIn PDF document text
    • https://38c8c62e-1823-4c1e-8220-bc61efcc8a1c.filesusr.com/ugd/c24b9b_201120dc4055485499ff68ea0e6ee042.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wofaxil/adivasi_dance_video.pdfIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_c302980813ea4f4d8076742574ccbb3c.pdf?index=trueIn PDF document text
    • http://ratobewiwigu.atwebpages.com/old_testament_bible_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tojabixefova/vizio_sound_bar_2.1_built_in_subwoofer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d33b496-2f1d-49a0-908e-d3b8ad04dd50/manual_de_funciones_de_una_empresa_industrial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb1b3597-5526-45df-8d94-7ac8cbf67b71/how_do_i_reset_my_keurig_coffee_maker.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_off0001287e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287E 5720 bytes
SHA-256: 989410af8a41206403754aa85b3d04927533379bbf292b718e3c9c05d4b3d7fb
font_01_sfnt_off00013be7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BE7 11020 bytes
SHA-256: 19191535941414273a20a54c8533116174fe1741f6f31c191d55a8bc86e42ab9