Malicious PDF — malware analysis report

Static analysis result for SHA-256 c336dc5ac2cbeaa5…

MALICIOUS

PDF

76.6 KB Created: 2021-04-19 18:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 572027693781a2c3f7bf468a75039120 SHA-1: b1cc0ed9367a24fa74228806d1dbd84ae6b36981 SHA-256: c336dc5ac2cbeaa5958994ef0bcdb268935dcff8bf9f5c9e327adafc5139c502
96 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 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://jottigo.ru/strik?utm_term=system+verilog+interview+questions+and+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486213/normal_603b0864102f6.pdfIn PDF document text
    • https://cdn.sqhk.co/jivazufevi/iigfojf/viremugojonu.pdfIn PDF document text
    • https://wozavosasegug.weebly.com/uploads/1/3/4/5/134509229/jazemav.pdfIn PDF document text
    • https://cdn.sqhk.co/bosesegivu/Av4pPja/castle_of_illusion_remake_switch.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530910/normal_600086c5c2c83.pdfIn PDF document text
    • https://tunimesepet.weebly.com/uploads/1/3/1/4/131455680/972bbe.pdfIn PDF document text
    • https://cdn.sqhk.co/namulofilox/gjEK2n6/kuzixi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480584/normal_6046e18a6fff2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426697/normal_601fd6a2eaa9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419211/normal_6036c5dd7ff46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443801/normal_60161cab4f35a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485301/normal_605bfe1dece4e.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/vufuzewasi/58438868841.pdfIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/40166097346.pdfIn PDF document text
    • https://s3.amazonaws.com/poresi/lg_l90_sim_card_size.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/25675250445.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/what_are_the_new_laws_for_california_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/how_to_pass_the_nj_written_driving_test.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/how_to_check_transmission_fluid_in_1994_chevy_s10.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_off0000e9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A5 5628 bytes
SHA-256: fb75cd0d55176699df9607b5cc72d259e0c20456cce1cae12fde41a5ca7d0524
font_01_sfnt_off0000fcbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBF 11360 bytes
SHA-256: fe3372d7b6c53840d56d5be1b949ceb61582cda5ba2e34900ff47efc268dc786

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