PDF malware analysis — malicious · 6464a4cbea60d4e5

MALICIOUS

PDF

53.6 KB Created: 2020-04-06 05:33:19 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)

MD5: 6be128670878bb94716efde9d40c9c40 SHA-1: e35c9f2c05201916e785ec86531809716b5cfdd6 SHA-256: 6464a4cbea60d4e54f6e7cc3dc3af8656849dfc7910159d557f44d1518a1a6c7

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 of which point to similarly structured URLs, indicating a link farm or SEO spam campaign. The document body text, though partially corrupted, includes a URL that is part of this network. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent to redirect users to potentially harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9979

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://natalierupp.com/uploads/1/3/1/0/131070113/131070113.html#cual+es+la+raiz+cuadrada+de+2690
- http://diggingdinner.com/uploads/1/3/0/6/130621299/72f51e317ef.pdf
- http://cpbservice.com/uploads/1/3/1/3/131384227/kezodejorubesipuje.pdf
- http://leadcorpus.com/uploads/1/3/0/4/130488486/d6404375.pdf
- http://no-such-thing.org/uploads/1/3/1/4/131453894/608b8ab.pdf
- http://appletonparenteducation.com/uploads/1/3/0/7/130775131/f546ce324ca68b.pdf
- http://infinitywellnessconnection.com/uploads/1/3/0/6/130620473/4b2cff024e.pdf
- http://barmuscleup.com/uploads/1/3/0/5/130551211/4933536.pdf
- http://soxpal.com/uploads/1/3/0/3/130323581/xujomanuke_wukubewuw.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- 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/
- https://savannah.gnu.org/projects/freefont/
- http://www.gnu.org/licenses/
- http://www.gnu.org/copyleft/gpl.html
- https://fedoraproject.org/wiki/Licensing/LiberationFontLicense
- http://dejavu.sourceforge.net
- http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00006b76.bin` `1957428794578a072b8983e864e5701b52391162abfb2d6d14c6295fa8a16687`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6B76	6444 bytes
`font_01_sfnt_off00007b39.bin` `64c490c37cef516800fe4d7ca643dc1ed08b600db7399a7b814bb5f16b35a003`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7B39	10292 bytes
`font_02_sfnt_off0000a043.bin` `014b883c0d038e383903631a5fcffcc244b58e9f619ee7c1c744a32498a722c9`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xA043	5016 bytes
`font_03_sfnt_off0000b0d6.bin` `893b9af18feb1adfdf9be166e91a29f6579e446fc4e1cf2129b46ea14f7cb700`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB0D6	16360 bytes

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