Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f15e017578ffad4…

MALICIOUS

PDF

77.7 KB Created: 2021-02-23 23:48:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ea281199ea5c199e973b7dca2d3d38c9 SHA-1: 3cf2d54e1977657bf96b160f9fd6257125eb6e83 SHA-256: 9f15e017578ffad44974c3c3492afefb284eef7db550e077f064abb1c1a703d0
96 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a link farm, indicating a large number of external links pointing to other PDFs. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were extracted, the presence of numerous external links suggests a tactic to redirect users to potentially malicious content or to manipulate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://druttle.ru/wix?keyword=chemistry+final+study+guide+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417413/normal_5fd194d271269.pdfIn PDF document text
    • https://sawotulexude.weebly.com/uploads/1/3/5/2/135298589/4644860a4084692.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402244/normal_5fd7502152e3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488101/normal_6019d589b2285.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464700/normal_601d7c0033a3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424632/normal_5fdc47e6cdb34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489056/normal_600a01e1532e4.pdfIn PDF document text
    • https://mudulavodeg.weebly.com/uploads/1/3/1/0/131070753/d49f49dc4c50d6.pdfIn PDF document text
    • https://vozozexofevufut.weebly.com/uploads/1/3/1/8/131871902/ddf93.pdfIn PDF document text
    • https://goremafijitem.weebly.com/uploads/1/3/4/6/134617837/e122d5691682a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383702/normal_5fe3a1b5a3b83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500883/normal_5fe6b2eec87d4.pdfIn PDF document text
    • https://satumumitexa.weebly.com/uploads/1/3/4/3/134347851/bazilowowowofe-xujipuri.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/vukusa/drpu_bulk_sms_software_crack_free.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/tinevodatawevenedow.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/break_up_every_night_song.pdfIn PDF document text
    • https://s3.amazonaws.com/rirusozo/general_chemistry_dictionary.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/nios_assignment_format.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/pak_studies_9th_class_chapter_2_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/givavajekuvidili.pdfIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/bhimavaram_bullodu_movie_songs_in_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/numuwejexonigono.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_off0000f21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21B 5464 bytes
SHA-256: 892f71c19786790fbdcb491e09a62fa3af3fc83c8051b6bd7e39444b979cf22f
font_01_sfnt_off00010481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10481 10720 bytes
SHA-256: 43e0fabd0f4e054c2908296e5f5d657acf4488bdc8ea86907e1844a48f97abe3

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