PDF malware analysis — malicious · e984eede105bc178

MALICIOUS

PDF

50.8 KB Created: 2020-03-20 11:17:35 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)

MD5: de930e6db5a0ed857a5810b19c70b0b3 SHA-1: 5c4f27ed05680257451395e74cf4ff9261a82283 SHA-256: e984eede105bc178ff3ed32ec593a48fe88c86825317f5670102764bd2545886

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 to various domains, a technique commonly used for SEO link farming or to redirect users to malicious content. The ML classifier strongly indicated maliciousness. The document body contains text related to 'Chi cuadrado formula' and metadata indicating it was generated by wkhtmltopdf, suggesting a potential lure or obfuscation technique.

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://yogalifesf.com/uploads/1/3/0/3/130323145/130323145.html#chi+cuadrado+formula
- http://www.johnnylayne.com/uploads/1/3/0/6/130621195/wupidedal.pdf
- http://ideasdesignservices.com/uploads/1/3/0/7/130738504/bupogiforetupif.pdf
- http://128lumber.com/uploads/1/3/0/7/130776678/muposesafi_vasodokisa.pdf
- http://thepacketpusher.net/uploads/1/3/0/4/130435986/c6a7f7.pdf
- http://3mtruedefinition.com/uploads/1/3/0/4/130489706/ad43af8c2989d8b.pdf
- http://importeddesignz.com/uploads/1/3/0/4/130476204/bugogik_xoradipog_jalap_nizikirubepaxem.pdf
- http://rockpileranchtx.com/uploads/1/3/0/5/130551449/5b1598e01.pdf
- http://austinengravingandsublimation.com/uploads/1/3/0/5/130540214/e3d387be19f231f.pdf
- http://maddspresto21.net/uploads/1/3/0/4/130483210/pigujo.pdf
- http://marketdecisionpoint.com/uploads/1/3/0/9/130969026/998930381fe830.pdf
- http://ryanconstruction.ca/uploads/1/3/0/7/130738623/rosetuw.pdf
- http://redraygun.com/uploads/1/3/0/7/130739690/9c999ad5ec.pdf
- http://www.seamf.org/uploads/1/3/0/4/130489423/wevetujanibes-laninanu-nowakusupefigom.pdf
- http://tylerbgeorge.com/uploads/1/3/0/2/130270762/7222523.pdf
- http://sportykids.se/uploads/1/3/0/7/130776599/gexida.pdf
- http://simplecompletions.com/uploads/1/3/0/9/130969608/fakulosudup.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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000839d.bin` `973b1127c258ab682448d75d006edb5ce499e149b866a1ac0a134efa952b975e`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x839D	10064 bytes
`font_01_sfnt_off0000a7b8.bin` `779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xA7B8	16036 bytes

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