Malicious PDF — malware analysis report

Static analysis result for SHA-256 b14b771dbbd2420b…

MALICIOUS

PDF

72.2 KB Created: 2021-02-28 14:20:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c087a97b7261b5e5e558fa5411d942af SHA-1: 55e2e3ef439c4f6ea032a2724109b1a397a454a9 SHA-256: b14b771dbbd2420b46ccfc063ca167c254f2820a807715bece953397fd89df13
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or a method to distribute further malicious content. The presence of a 'download button' heuristic further supports a lure-based attack. The ML classifier strongly indicated maliciousness, aligning with the observed link farm and potential for user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ponafet.ru/wix?keyword=google+cloud+search+for+education
    • https://sopunarexij.weebly.com/uploads/1/3/1/8/131857112/385321.pdf
    • https://doliwejivus.weebly.com/uploads/1/3/4/3/134353379/18880ce1d3e2e.pdf
    • https://pukakiliratof.weebly.com/uploads/1/3/4/7/134768090/4852952.pdf
    • https://vimexizud.weebly.com/uploads/1/3/4/7/134755563/gomojit.pdf
    • https://tozakewa.weebly.com/uploads/1/3/5/3/135398337/pijisekako_wegesilarabuv_voxafitu_tisexuvumi.pdf
    • https://laxopewivizi.weebly.com/uploads/1/3/5/3/135394850/tubulavi-refevavepitijok-tirasogumigu-lezoj.pdf
    • http://gamedv.design/elementary_probability_theoryxshqu.pdf
    • https://wolunogejafijut.weebly.com/uploads/1/3/4/6/134649672/zirex.pdf
    • http://steblin.pro/bose_cinemate_gs_series_ii_digital_home_theater_speaker_system_manualu1h9f.pdf
    • https://kurakozizuvev.weebly.com/uploads/1/3/2/6/132681999/43359.pdf
    • https://kanumipiga.weebly.com/uploads/1/3/5/3/135346224/fivudunogofite.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fewifuwu/resuscitation_council_uk_basic_life_support_guidelines.pdf
    • https://s3.amazonaws.com/kotodur/wukugufeni.pdf
    • https://s3.amazonaws.com/sizadagazagaj/big_book_awakening_san_diego_meetings.pdf
    • https://s3.amazonaws.com/dozore/checkbox_checked_in_reactive_form.pdf
    • https://s3.amazonaws.com/rojalexipokadaz/bam_bam_bhole_audio_song_free.pdf
    • https://s3.amazonaws.com/nuvukivaxiren/95151048618.pdf
    • https://s3.amazonaws.com/xeponodij/free_resume_templates_for_software_engineer.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de81.bin
5d4a7fa5c5e55f78aad01cd32982719edfd4e5917535177660f9f36b3e4ce703		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE81 5312 bytes
font_01_sfnt_off0000f08e.bin
feca89dd58bee00f9a6602571d0b81bdd47a4aab9ad0285e2e1ba56123f79ed2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF08E 10348 bytes

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