Malicious PDF — malware analysis report

Static analysis result for SHA-256 8546feefff109fd0…

MALICIOUS

PDF

96.2 KB Created: 2021-02-24 17:25:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 7c7110c42701fc570063d9c48e320c8a SHA-1: 2c1c3f846f6ae7da5c9863f275c4f33abdcf9a78 SHA-256: 8546feefff109fd035d94c553e62feae2046b38771e1ed93c60358675fc38284
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting it is part of a link farm designed to manipulate search engine results. The primary URL appears to be a lure related to 'musical notes clip art white'. While no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of malicious SEO tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://seumenha.ru/strik?utm_term=musical+notes+clip+art+white PDF link annotation
    • https://jevamupoledi.weebly.com/uploads/1/3/4/7/134712268/lezanos.pdfIn PDF document text
    • https://ziresaro.weebly.com/uploads/1/3/4/5/134509830/2115928.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464311/normal_5fceccc9d66ac.pdfIn PDF document text
    • https://fujifarilopo.weebly.com/uploads/1/3/4/4/134483008/2aebb9a6.pdfIn PDF document text
    • https://wopeduvolevim.weebly.com/uploads/1/3/0/7/130776212/357710.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369776/normal_5fcbb0487eb7d.pdfIn PDF document text
    • https://juxibawazorar.weebly.com/uploads/1/3/3/9/133997202/finofisuwej-kudedon-dunutagim.pdfIn PDF document text
    • https://loxogekero.weebly.com/uploads/1/3/4/0/134040689/3740040.pdfIn PDF document text
    • https://bevamiwe.weebly.com/uploads/1/3/0/7/130739198/dopos_wavojosurujovi_nimosuwe_maxebefegawelod.pdfIn PDF document text
    • https://sokifaxus.weebly.com/uploads/1/3/4/6/134666683/zarodaminiwajizumed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391620/normal_5fe03a92a766f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494440/normal_602885bc7cf02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421329/normal_601716a0edc42.pdfIn PDF document text
    • https://wobofosowipifir.weebly.com/uploads/1/3/0/7/130776138/sulugot.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365639/normal_5fc6a1756b606.pdfIn PDF document text
    • https://towipikegogu.weebly.com/uploads/1/3/4/6/134690187/kokaxuxurig_vukemi_lijexejena.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448731/normal_5fcc5a11b1643.pdfIn PDF document text
    • https://libigidibejaxa.weebly.com/uploads/1/3/3/9/133997225/1992238.pdfIn PDF document text
    • https://rotarivinevi.weebly.com/uploads/1/3/4/5/134599250/ladipikirib.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/kosamupim/accordion_music_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/star_wars_blaster_sound_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/gastroenteritis_aguda.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11971 5120 bytes
SHA-256: 0daf0a63723b665aba0a5671c891a0671f59816ec52ecdd05b973ce3ea1fbc5a
font_01_sfnt_off00012af0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF0 16280 bytes
SHA-256: e61d3a81888125eacd51afcece7ded8120649281cfde9e97bd3d045f1041f7e1
font_02_sfnt_off00015d5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D5D 16200 bytes
SHA-256: f4fd55ddcbd8ce9ebd7b22767d40bbcfb10373bf2e4442ea370447971bbdb078

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