Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce1b26a81a2ff072…

MALICIOUS

PDF

46.7 KB Created: 2020-03-25 01:48:13 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1a42414f4ec307505f32e692d51abbea SHA-1: db0517a3238958255d92b30b13187edadef615fa SHA-256: ce1b26a81a2ff07280da05bc682b515f4662fd7800cee6bd3cca1db864ee66ed
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many with numeric or book-like slugs, indicative of a link farm or SEO spamming operation. The ML classifier strongly flagged this PDF as malicious. The document body, though partially corrupted, contains the phrase 'Padre nuestro en arameo letra y musica' and metadata indicating it was generated by wkhtmltopdf, suggesting a lure document designed to drive traffic to a network of potentially malicious or SEO-abused websites.

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 http://irieint.com/uploads/1/3/0/7/130776252/130776252.html#padre+nuestro+en+arameo+letra+y+musica
    • http://nyenrode-alumni.com/uploads/1/3/0/2/130270996/rewelonasep.pdf
    • http://www.susancolours.com/uploads/1/3/0/4/130483191/b705f919ed.pdf
    • http://amplusadvecta.com/uploads/1/3/0/6/130604859/8545859.pdf
    • http://shanxguitars.com/uploads/1/3/0/6/130621011/ec4422c7795da.pdf
    • http://brooklynbun.com/uploads/1/3/0/2/130287279/koxupulivuvamu.pdf
    • http://palletdaddyliquidation.com/uploads/1/3/0/6/130604735/doroxat_nobutav.pdf
    • http://smitschilderwerken.net/uploads/1/3/0/4/130489019/megebuvinavi.pdf
    • http://creativelynatty.com.au/uploads/1/3/0/6/130604002/divelatajo_nutemaxu_kejodex_felasiduvob.pdf
    • http://greeneprojectcounseling.com/uploads/1/3/0/4/130476207/pavijo_fugiwin_vupijene.pdf
    • http://www.suburbanhomesofwny.com/uploads/1/3/0/6/130604887/xomobutaruduw_lilisowotebum.pdf
    • http://www.jackmcmahonfilm.com/uploads/1/3/0/6/130605078/6293316.pdf
    • http://rockerrdigital.com/uploads/1/3/0/6/130621220/5048118.pdf
    • http://joeytorkelson.com/uploads/1/3/0/7/130738625/1154802.pdf
    • http://alfredocoelhoart.com/uploads/1/3/0/5/130545098/gefebidekepu_wifinepimivila_fokavew.pdf
    • http://mountaintrafficcircle.com/uploads/1/3/0/5/130590413/a09d8.pdf
    • http://strawhatgames.com/uploads/1/3/0/4/130483629/2144836.pdf
    • http://materialpricing.net/uploads/1/3/0/8/130873791/bogorib.pdf
    • http://hostmaster.aitepeople.com/uploads/1/3/0/2/130289481/5015461.pdf
    • http://www.barbellvillains.com/uploads/1/3/0/6/130621357/0e5ea8.pdf
    • http://digitalfreebies.net/uploads/1/3/0/4/130488123/8971120.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007622.bin
df9986b75bd7d1b8d3c994997c969df5eecd076236acbd5af3920e73f4f06eb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7622 9268 bytes
font_01_sfnt_off000097ad.bin
50224c6c483bfa86a10f62efd7baa2c756f8036c0a911ebd537387e21b2fb6f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97AD 2732 bytes
font_02_sfnt_off0000a144.bin
b133d2ba8c54b7310bd2a5d38206394d05d7e181f35e2a030cfae1cd9fd81be6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA144 1808 bytes

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