Malicious PDF — malware analysis report

Static analysis result for SHA-256 19b4201a09540f41…

MALICIOUS

PDF

47.3 KB Created: 2020-11-09 02:05:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 5bc09a77935280a742b62e808aa8556b SHA-1: 16ceec58f6fc6a960f011ea763e1ecce876958ae SHA-256: 19b4201a09540f41c852ab3f5ca7dd2b7b4a27be3b6437281ea9fe2548b93f7f
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 1.0000

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://trafffi.ru/123?keyword=what+is+depth+of+field+quizlet PDF link annotation
    • https://dasujodiket.weebly.com/uploads/1/3/4/4/134481559/9620505.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://pafegum.files.wordpress.com/2020/11/xumakosokidazok.pdfIn PDF document text
    • https://s3.amazonaws.com/digigitusuduk/free_online_dvd_menu_maker.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/56166742656.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/mimepife.pdfIn PDF document text
    • https://milosibad.files.wordpress.com/2020/11/jubeniwodag.pdfIn PDF document text
    • https://risagifilona.files.wordpress.com/2020/11/vigupefeguf.pdfIn PDF document text
    • https://lonofoxov.files.wordpress.com/2020/11/19943643404.pdfIn PDF document text
    • https://wubazij.files.wordpress.com/2020/11/59804519021.pdfIn PDF document text
    • https://diwuluj.files.wordpress.com/2020/11/zagesotaxum.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/anticonvulsivantes_em_pediatria.pdfIn PDF document text
    • https://bedirolipe.files.wordpress.com/2020/11/pictionary_word_list_difficult.pdfIn PDF document text
    • https://lofapaner.files.wordpress.com/2020/11/rexuzubuzu.pdfIn PDF document text
    • https://fidoroz222495772.files.wordpress.com/2020/11/jaxifug.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/revise_for_cambridge_primary_checkpoint_english.pdfIn PDF document text
    • https://lixuzab.files.wordpress.com/2020/11/otogi_spirit_agents_gift_code.pdfIn PDF document text
    • https://kodekisi.files.wordpress.com/2020/11/mining_stardew_valley.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_off00007848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7848 5220 bytes
SHA-256: c25c61c4af1065156819a21d1277811c92c8cc0fbe9ae73441a1a190a4de04e6
font_01_sfnt_off00008a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A23 11340 bytes
SHA-256: 9ff1cf04ea93130797836b2fea3b028e36fc782da8d557e9f7ddfdd774cc024f

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